Can't believe I haven't seen this thread before. Some great recommendations in here - Leffe, Duvel, Delirium. Love my Belgian beers and there used to be a bar near me which had about 10 pages of them but it's closed down now
Anyway, here's my recommendations:
Troubadour Blond - definitely the best blonde beer I've tasted from Belgium. Quite similar to Leffe but with an ever more pleasant aftertaste.
Hercule Belgian stout - fantastic Belgian dark beer, great taste and a nice sipping beer (you probably wouldn't want more than a couple of these unless you want days of miserable headaches). Great bottle too - very Belgian looking man with a green moustache!
Orval - very refreshing and a good alternative to Duvel if you want to try something different. If you have been to a Belgo restaurant you might have tried it there already.
Barbar - if you are into your fruity beers or want to try something a bit sweeter, then this honey beer is the best of the lot. It's not overly sweet but if you like your bitters then it's probably not for you. Also, it gave me a rotten hangover. Tasty as fuck though!!
Also, seen some good American beers here. I really enjoy Anchor and had Fat Tire when is was in California, but here are a couple of beers I found while I was there:
Arrogant Bastard Ale - my god this stuff is strong but the taste is unbelievably good. If you like strong ,dark beers then you can't go wrong. It's expensive but at least the bottle is a good size. Also, the writing on the back is pretty funny (I think Brewdog in the UK are copying their style). In fact, try anything from the Stone Brewery and you won't go far wrong. This one is also epic:
Bear Racer 5 - from a small brewery in California comes this fantastic IPA - haven't had a better one before or since. Unfortunately I have looked everywhere and cannot find it in the UK so this is more of a recommendation to the American RAWKites.
A good website to buy some good international beers in the UK is this place - their stock is massive and it's a good service. Plus, if you order by the crate then it's not too expensive.
http://www.beersofeurope.co.uk/acatalog/Enjoy!!!!