That's not entirely true. I had started to organize my mp3 collection before I got the iPod, particularly because I've been doing sound for IRLM events a lot the last few months. Two events without knowing I was expected to provide background music and I just don't travel without the laptop anywhere any more. The iPod has just made it much more practical to organize things (what with multiple computers with different hard drive sizes).
Anyway, I've got (I think) my current mp3 collection consolidated, and have cleaned up much of the data-rot that comes from bad and incomplete entries in Gracenote CDDB. I also picked up a great tool called iTunes Catalog to publish my track listings.
Take a look at the listings. Tell me if you think the genre that I (or more likely CDDB) put an album or song in is crazy. Tell me where you think it ought to be. Can't guarantee I'll listen to you (but that's normal).
(Oh, and yes, this is only part of the CD collection; I stopped ripping new CDs for a while while cleaning up the old data. I'll start again soon.)