I know we had previous discussions about the best mp3 tag/renamer previously, so here is a complementary topic: good mp3 catalog programs. I don't have time to do a full-blown review right now, but my vote goes to MP3 Collector from:
http://www.collectorz.comIt's great, I've used it for years. It's highly customizable, etc. All the things a poweruser could want. I'd also be interested in others' opinions. Other programs I've run across are:
Mp3rat
http://www.kaylon.com/mp3rat/It's by the maker of Powermarks, the best web bookmarking program ever. Honestly, I've never tried the program, but if it's by the same author, I assume it's a good program with some interesting features, possibly.
There's another program that I've never tried, and the name escapes me right now, but it's by the same guy who wrote a program to automatically scan directories and attach the bitrate to the folder name. I'll post the actual name and link when I get home. Anyway, he mentions that his program is extremely efficient and can scan thousands of mp3's in very little time. Anyway, just based on the author's reputation, I'm assuming it's a good program also.