I tried Litecoin with my GPU but that apparently requires some tuning at which I seem to fail. Even my CPU has higher hash rates than my 5770?!

Problem with mining is the low reward you get. Mining on new altcoins gets you much more coins, but they are useless as long as they don't take off. And how will they take off if nobody cares about yet another altcoin?

If only I started mining a few months back, when it was easy to mine... I'd be filthy rich now :-P