Over the last couple years Ive acquired a taste for Racer 5 IPA. But the thing with that stuff is you shouldn't have more than two Pints or else you'll get a terrible Hangover. For something lighter I like Blue Moon. Good Old PBR is still a favorite too.
I've beend drinking Rothaus Tannenzäpfle from the Black Forest area of Germany, which is a bit more bitter than a normal German beer (my opinion, at least) but not as bitter as what might be found up north.
During the winter months I enjoy a dark Weizen beer as well. I prefer Erdinger but generally get Shöfferhofer since I'm in Frankfurt and it's plentifully stocked. A nice Guiness does the trick as well when it's colder outside.