user3607: OK, my most immediate concern is that I made three ~$500 bitcoin purchases this weekend and downloaded the Bitcoin-Qt client, but ran out of HDD space just before it finished synchronizing the BlockChain, and now I don't even know what my BTC balance is, if my value is lost, or what.
Now I don't know what to do.
I was at least bright enough to have made a screen print of the three bitcoin addresses from the client and also of my BitInstant orders (while they show the destination address and $ amounts paid/recieved, they don't list the amount of bitcoin I assume and hope that I received), but I can't find my private keys in the client, though it appears that I am able to Send Coins from the tab of that name.
I don't even know what my total amount of bitcoin is since Bitcoin-Qt hasn't finished synch-ing up, and I'm just sort of stuck without either bitcoin or fiat since my HDD is down to only ~200MB left with 1,746 blocks remaining.
What should I do?
I read that the Multibit and Electrum wallets seem to need less computer resources, so I was thinking/hoping that I could maybe transfer my bitcoin to one of those wallets, or maybe to the StrongCoin online wallet or other secure recommendation as an interim step, but I don't even know the precise quantity of bitcoin that I should have in my bitcoin addresses, or if I can even send them without knowing my private keys.

user3136: If you know what bitcoin address your bitcoins are coming to (and you should know if you expect to get your bitcoins), you can lookup balance on blockchain.info like this:
http://blockchain.info/address/your-address
replace your-address with your actual bitcoin address, for example here some random address i found: 
http://blockchain.info/address/1LNx3azmdKyH43UsJ6DK9oUrTbkPUr6UJg

3607: <p>OK, my most immediate concern is that I made three ~$500 bitcoin purchases this weekend and downloaded the Bitcoin-Qt client, but ran out of HDD space just before it finished synchronizing the BlockChain, and now I don't even know what my BTC balance is, if my value is lost, or what.</p>

<p>Now I don't know what to do.</p>

<p>I was at least bright enough to have made a screen print of the three bitcoin addresses from the client and also of my BitInstant orders (while they show the destination address and $ amounts paid/recieved, they don't list the amount of bitcoin I assume and hope that I received), but I can't find my private keys in the client, though it appears that I am able to Send Coins from the tab of that name.</p>

<p>I don't even know what my total amount of bitcoin is since Bitcoin-Qt hasn't finished synch-ing up, and I'm just sort of stuck without either bitcoin or fiat since my HDD is down to only ~200MB left with 1,746 blocks remaining.</p>

<p>What should I do?</p>

<p>I read that the Multibit and Electrum wallets seem to need less computer resources, so I was thinking/hoping that I could maybe transfer my bitcoin to one of those wallets, or maybe to the StrongCoin online wallet or other secure recommendation as an interim step, but I don't even know the precise quantity of bitcoin that I <em>should</em> have in my bitcoin addresses, or if I can even send them without knowing my private keys.</p>
 3136: <p>If you know what bitcoin address your bitcoins are coming to (and you should know if you expect to get your bitcoins), you can lookup balance on <a href="http://blockchain.info" rel="nofollow">blockchain.info</a> like this:</p>

<p><a href="http://blockchain.info/address/" rel="nofollow">http://blockchain.info/address/</a><strong>your-address</strong></p>

<p>replace <strong>your-address</strong> with your actual bitcoin address, for example here some random address i found: </p>

<p><a href="http://blockchain.info/address/1LNx3azmdKyH43UsJ6DK9oUrTbkPUr6UJg" rel="nofollow">http://blockchain.info/address/1LNx3azmdKyH43UsJ6DK9oUrTbkPUr6UJg</a></p>
