Replay Music is a great program, but I prefer to rip radio stations rather than record from my sound card.

I use freeware StreamRipper to record Shoutcast radio stations.

I also like RadioTracker. It can record MP3 music you've selected as soon as it is played on any of over 14,000 watched Shoutcast radio stations worldwide.

It is not very good when songs are overlapped. StreamRipper is probably the best stream capturing software for such Shaoutcast streams.