user78: XRP are the units of the new Ripple.com system.
Where can I find how much they're worth right now? Historic charts?

user78: The orderbook (found inside the Ripple client once you're logged in and funded) does in fact show the price, it's just a huge spread and confusing UI that makes it difficult to understand now.
Right now, the best bid is:
10BTC   10BTC   5,000.00000XR
And the best ask is:
43,998.00000XRP 10BTC   10B
Which means someone is proposing to buy BTC at the price of 5000 XRPs, and another person is offering to sell BTC at the price of 43,399.8 XRP. So, the spread is huge, but one can still say the "price" of 1 XRP right now is somewhere between 0.000002 and 0.0002 BTC

user192: Since the internal trade history will be public, I guess a service could be built to show price statistics. You would watch the prices of the most traded IOUs, presumably from gateways. Examples: wexUSD, wexBTC, wexEUR, etc.
The site could have several tools to group several currencies of the same denomination (but different issuers) averaging by volume or something like that. It could be similar to bitcoincharts, but pulling the data from the ledger instead of the exchange's servers. 
I guess the core needs to be released first.

user4860: You can check Ripple (XRP) market chart at Bitcoincharts.com/market/Ripple

user3163: I just made a simple website which shows XRP price for different gateways. No historic charts yet.. http://xrpvalue.com/

user99: Update 2: There are now more traditional price / volume charts: 

BTC:Bitstamp/XRP at RippleCharts.com
USD:Bitstamp/XRP at RippleCharts.com

Update: Ripple Live Orderbook and Charts by webr3 provides various bitstamp style charts and orderbooks for various XRP/xxx pairs.
Update: The Ripple Ledger Explorer by melvster shows a graph of Ripple vs Bitcoin prices.  It also shows recent ledger activity.

Early on there was also a manually-updated list at:

Ripple: XRP Price Tracker

The discussion there had a nice example of what an order book snapshot from the ripple client looks like, with headers.
The #ripple-market irc channel at freenode.net also shows real-time trades via a "Streaming exchange feed for notable #ripple gateways" all trades.  You can see it via

freenode Web IRC

A trade example looks like this:
< ripplebot> TRD bitstamp 730.698114 @ 48,713.2076 BTC rwdLV79WzXmFuzP2cBwTG6mtXcfSnCjtoF #142

I assume that means that the price for that transaction was 48,713 XRD per BTC, and I'm guessing that 730 XRD were traded at that price via bitstamp, but I haven't seen good documentation yet.
Here is an example ASK report:
ASK bitstamp 347.152555 @ 41,854.251463 BTC rwdLV79WzXmFuzP2cBwTG6mtXcfSnCjtoF #143

The code for ripplebot can be found at

rippleFoundation/ripple-watch · GitHub


78: <p>XRP are the units of the new Ripple.com system.</p>

<p>Where can I find how much they're worth right now? Historic charts?</p>
 78: <p>The orderbook (<a href="https://ripple.com/client/#trade" rel="nofollow">found inside the Ripple client</a> once you're logged in and funded) does in fact show the price, it's just a huge spread and confusing UI that makes it difficult to understand now.</p>

<p>Right now, the best bid is:</p>

<p>10BTC   10BTC   5,000.00000XR</p>

<p>And the best ask is:</p>

<p>43,998.00000XRP 10BTC   10B</p>

<p>Which means someone is proposing to buy BTC at the price of 5000 XRPs, and another person is offering to sell BTC at the price of 43,399.8 XRP. So, the spread is huge, but one can still say the "price" of 1 XRP right now is somewhere between 0.000002 and 0.0002 BTC</p>
 192: <p>Since the internal trade history will be public, I guess a service could be built to show price statistics. You would watch the prices of the most traded IOUs, presumably from gateways. Examples: wexUSD, wexBTC, wexEUR, etc.</p>

<p>The site could have several tools to group several currencies of the same denomination (but different issuers) averaging by volume or something like that. It could be similar to bitcoincharts, but pulling the data from the ledger instead of the exchange's servers. </p>

<p>I guess the <a href="https://github.com/rippleFoundation/ripple" rel="nofollow">core</a> needs to be released first.</p>
 4860: <p>You can check Ripple (XRP) market chart at <a href="http://bitcoincharts.com/markets/rippleXRP.html" rel="nofollow">Bitcoincharts.com/market/Ripple</a></p>
 3163: <p>I just made a simple website which shows XRP price for different gateways. No historic charts yet.. <a href="http://xrpvalue.com/">http://xrpvalue.com/</a></p>
 99: <p><strong>Update 2</strong>: There are now more traditional price / volume charts: </p>

<ul>
<li><p><a href="https://ripplecharts.com/market/BTC%3aBitstamp/XRP" rel="nofollow">BTC:Bitstamp/XRP at RippleCharts.com</a></p></li>
<li><p><a href="https://ripplecharts.com/market/USD%3aBitstamp/XRP" rel="nofollow">USD:Bitstamp/XRP at RippleCharts.com</a></p></li>
</ul>

<p><strong>Update</strong>: <a href="http://xrp.webr3.org/" rel="nofollow">Ripple Live Orderbook and Charts</a> by webr3 provides various bitstamp style charts and orderbooks for various XRP/xxx pairs.</p>

<p><strong>Update</strong>: The <a href="http://rippledb.com/" rel="nofollow">Ripple Ledger Explorer</a> by melvster shows a graph of Ripple vs Bitcoin prices.  It also shows recent ledger activity.</p>

<hr>

<p>Early on there was also a manually-updated list at:</p>

<ul>
<li><a href="https://bitcointalk.org/index.php?topic=148185.0" rel="nofollow">Ripple: XRP Price Tracker</a></li>
</ul>

<p>The discussion there had a nice example of what an order book snapshot from the ripple client looks like, with headers.</p>

<p>The #ripple-market irc channel at freenode.net also shows real-time trades via a "Streaming exchange feed for notable #ripple gateways" all trades.  You can see it via</p>

<ul>
<li><a href="http://webchat.freenode.net/" rel="nofollow">freenode Web IRC</a></li>
</ul>

<p>A trade example looks like this:</p>

<pre><code>&lt; ripplebot&gt; TRD bitstamp 730.698114 @ 48,713.2076 BTC rwdLV79WzXmFuzP2cBwTG6mtXcfSnCjtoF #142
</code></pre>

<p>I assume that means that the price for that transaction was 48,713 XRD per BTC, and I'm guessing that 730 XRD were traded at that price via bitstamp, but I haven't seen good documentation yet.</p>

<p>Here is an example ASK report:</p>

<pre><code>ASK bitstamp 347.152555 @ 41,854.251463 BTC rwdLV79WzXmFuzP2cBwTG6mtXcfSnCjtoF #143
</code></pre>

<p>The code for ripplebot can be found at</p>

<ul>
<li><a href="https://github.com/rippleFoundation/ripple-watch" rel="nofollow">rippleFoundation/ripple-watch · GitHub</a></li>
</ul>
