I'm glad to announce another find: Primecoin.

I've decided to extend this list to the following categories:
24h volume 1 - 0.5 BTC
24h volume 0.5-0.3 BTC
24h volume 0.3-0.1 BTC
24h volume 0.1 - 0.05 BTC
24h volume 0.05-0.01 BTC