Most (if not all) of the "Currency Clones" listed are scams. Be careful. Generally, the only coins you want to pay attention to are BTC and LTC.
Here you can watch the steady stream of altcoins and their scam practices.
Here you can watch the steady stream of altcoins and their scam practices.
I'd suggest only including the "major" ones listed on that page. The rest are trivial knockoffs.