My favorite gotta be Newcastle Brown Ale the tradional Geordie beer especially when I watch my favorite footie team.
I also like; Hoegaarden the classic Belgian white beer when getting sofiticated, Urquell the 'real' Czeck pilsner from Plzn (yes, that's how it's spelled) for relaxing after work, the dutch Amstel Gold on a hot day, VB (Victoria Bitter) as a warm up for getting some shots, and finally Ceres Royal Export for getting some heavy drinking done.
If you'd like to try some beers a little out of the ordinary I'd recommend trying; La leffe, Chimay, and especially the extremely pricey Carlsberg Sember Ardens (3 different kinds sold in 1½ pint bottle at $12 a bottle here).