Desperados, Hobgoblin, Top Banana, Bishop's Finger, Sheepshagger, Old Speckled Hen, Old Crafty Hen, Erdinger, Leffe, Hoegaarden, Tsingtao to name a few that I really like.
I'd encourage people who like good beers to try Innis & Gunn and Deuchars IPA from my home town (although you can get them all over the UK at least). I also belieive Innis & Gunn is proving very popular in canada.