user14319: How many bitcoin clones are out there? 
I mean people changing the name, the hashing algorithm and a few more parameters and creating a new coin that just keeps on copying bitcoin's source code in eternity? 
Is there a list of those somewhere? 

user7043: A list of relevant cryptocurrencies and their differences can be found on the wiki. Also (almost) every new altcoin starts with a thread on Bitcointalk, where all necessary information should be stated in an announcement. See also this article about alternative chains on the wiki.

user12645: My favourite today is mapofcoins.com
You can browse alt-coins list here: coinwik.org
You can compare coins here: coinplorer.com/Hardware/CurrenciesComparison 
There is forum, cryptocointalk
See, here coingen.bluematt.me and +10 hidden market places with constructors. 
You can't find full list of all alt-coins. It doesn't exist.
Number of alt-coins grows so fast. Probably, every day there are appear 10-20 alt-coins. This is unstoppable trend. In the Jan of 2015 there will be more than 1000 alt-coins in one hundred percent.

Edit:

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14319: <p>How many bitcoin clones are out there? </p>

<p>I mean people changing the name, the hashing algorithm and a few more parameters and creating a new coin that just keeps on copying bitcoin's source code in eternity? </p>

<p>Is there a list of those somewhere? </p>
 7043: <p><a href="https://en.bitcoin.it/wiki/List%5fof%5falternative%5fcryptocurrencies" rel="nofollow">A list of relevant cryptocurrencies and their differences</a> can be found on the wiki. Also (almost) every new altcoin starts with <a href="https://bitcointalk.org/index.php?board=159.0" rel="nofollow">a thread on Bitcointalk</a>, where all necessary information should be stated in an announcement. See also <a href="https://en.bitcoin.it/wiki/Alternative%5fchain" rel="nofollow">this article about alternative chains on the wiki</a>.</p>
 12645: <p>My favourite today is <a href="http://mapofcoins.com" rel="nofollow">mapofcoins.com</a></p>

<p>You can browse alt-coins list here: <a href="http://coinwik.org/List_of_all_DCs" rel="nofollow">coinwik.org</a></p>

<p>You can compare coins here: <a href="http://coinplorer.com/Hardware/CurrenciesComparison" rel="nofollow">coinplorer.com/Hardware/CurrenciesComparison</a> </p>

<p>There is forum, <a href="http://cryptocointalk.com/forum/358-cryptocoins-cryptocurrencies/" rel="nofollow">cryptocointalk</a></p>

<p>See, here <a href="http://coingen.bluematt.me/status.html" rel="nofollow">coingen.bluematt.me</a> and +10 hidden market places with constructors. </p>

<p><strong>You can't find full list of all alt-coins. It doesn't exist.</strong></p>

<p>Number of alt-coins grows so fast. Probably, every day there are appear 10-20 alt-coins. This is unstoppable trend. In the Jan of 2015 there will be more than 1000 alt-coins in one hundred percent.</p>

<p><hr>
Edit:</p>

<p>See, another one constructor <a href="https://bitcointalk.org/index.php?topic=565417.0" rel="nofollow">COIN NUKE | COIN CREATION SERVICE | +EVERYTHING FOR YOU COIN +ESCROW +TOOLS</a> </p>
