Here's my top 10 list as best as I can remember. All of these films had 2006 UK release dates, some may have come out in 2005 in the states.

1. The Squid and the Whale
2. The Departed
3. Manderlay
4. Children of Men
5. Brick
6. Capote
7. Marie Antoinette
8. The Prestige
9. Superman Returns
10. Pan's Labyrinth

I'm sure a glaring omission will appear to me as soon as I post this. I am ashamed to say I have not yet seen Little Miss Sunshine or Borat.