Last.fm keeps track of what music I like so I don't have to. Here's a list of my favorite artists from 2006, apparently:
1. Boards of Canada
2. Ladytron
3. Cloud Cult
4. Marumari
5. Gnarls Barkley
6. Metric
7. John Digweed (good coding/writing music)
8. Röyksopp
9. I Love You But I've Chosen Darkness
10. Alexandre Desplat (Syriana soundtrack, haven't listened to this in six months)
11. Mogwai
12. Sigur Ros
13. Mint Royale (I didn't even like this)
14. Daft Punk
15. The Smashing Pumpkins (golden oldies)
16. Fischerspooner
17. Coldplay
18. Broken Social Scene
19. Sound Advice (Gnarls/Biggie mashup)
20. Bloc Party
21. Ulrich Schnauss
22. Sasha (good coding/writing music)
23. Wolf Parade (didn't like this either)
24. Clap Your Hands Say Yeah
25. Arctic Monkeys (nor this)
Not sure this is such an accurate representation of the music that I enjoyed this year. And where's CSS? I've been listening to them a ton in the last couple of weeks and they're not even on the list. Upon closer inspection, it looks like last.fm doesn't include the current month in their "rolling year charts".