I like:
Killian's Red
Yuengling
Amstel Light
Sam Adams (that Oktoberfest stuff is good; thanks Lori)
Chimay and Hoegarden(thanks KRC)
Berliner Kindl
Schultheiss
Icehouse (a good, cheap beer)
Pilsner Urquell (a good, not so cheap beer)
Rolling Rock (a guilty pleasure of sorts)
Capital City Brewing Co's kolsch and amber brews
Stroh's (another guilty pleasure; polished off many a 30 pack back in the day)
for starters.
and...
I dislike:
Pudweiser and its demon spawn (Pud Light, Pud Dry, Pud Reeks, etc.)
Gobel
Schaefer (man, does that stuff taste terrible)
Milwaukee's Best (a college staple, but what did I know then?)
I'm sure there's more, but that's a good start.