I saw that, but the page looked so....1990s?....that I wasn't sure how trustworthy it is. It's always good to hear someone's actually used it and it didn't turn install a Trojan or something!
Oops: forgot to mention I tried something called mp3splt (open source, free) that's supposed to be able to break by silence and not re-encode. Absolutely no manual on the GUI version (only descriptions of the command line options). In the short amount of time I was willing to futz around with it, I couldn't get it to work. But reading the description makes it sound like a good tool once you can figure out how to make it work.