Short answer:
http://www.last.fm/user/iamtef/
But last.fm isn't that accurate as I lost about two months of listening habits recently.
If I like the sound of an artist, I tend to get as much as I possibly can and then listen to it madly for a few weeks/months. This is why I have a huge spike on the playlist for things like Devo (Which I haven't listened to for a few months)
Bearing that in mind, this week I have been mostly obsessing over Komeda (swedish pop), and previous obsessions have been Stereolab, Devo, Polysics, Ratatat, and Tokyo Jihen.
Longer answer:
Other people think I have a diverse taste in music, but then again I'm yet to meet someone who thinks that their music collection isn't diverse to some extent.
To a certian extent, my music taste isn't that diverse because it seems to be a collection of slightly related fringe artists. If I like a band, I find out their influences, other bands from around the same era, same producer, same label, same members, and other bands that cite them.
It's probably easier to talk about what I don't listen to in terms of genres though. I haven't got into metal at all, I don't mind rock but It doesn't make me want to rock out, I've sung bits and pieces of classical music but haven't found a composer to obsess over yet. Jazz, Funk and soul are excellent, but I never get around to listening to them.
And EBM is like elevator music for goths.