My favorite beers are beers brewed in my native Ukraine. I know, I know, they are not world-famous (hopefully, "yet"), but there's just something amazing about them. My favorites are Obolon', Rohan', Chernihivs'ke. They are probably closer to "lager" type than to "ale" type, strong (but not overly bitter and not "stout"), crisp, with great after-taste.
I also like Czech beers, particularly Prazdroj, known in the USA as Pilsner Urquel (I drank in in Czech Republic and I must say it tastes better over there, probably because it does not like to be transported).
Because I have lived in Seattle for over 7 years, I became familiar with good Northwestern ales like Red Hook and Ballard Bitter IPA - they are good!
Hefeweizen, Blue Moon and the like, arrrgh... I like their taste, but my stomach does not handle them well, they are too acidic to me.