I've been looking for a USB audio interface to use with my iBook. I really want to find something not too large or expensive, but it seems the more I research, the more confused I get!
I'm currently looking at the Tascam US-122 and the Edirol UA-25, but as I said, I'm getting more confused as I go; and I have found other products too!
Some of the music instrument sites have reader comments, which can be a way to find out more about devices; or it can just end up confusing you more.
There's an interesting resource at the "Audio Field Recording Equipment Guide"