Dechutes
Black Butte Porter -- on the light side for a porter.
Stone Brewery
Arrogant Bastard Ale -- the name is enough, but it's also a great beer.
"This is an aggressive beer. You probably won't like it. It is quite doubtful that you have the taste or sophistication to be able to appreciate an ale of this quality and depth. We would suggest that you stick to safer and more familiar territory -- maybe something with a multi-million dollar ad campaign aimed at convincing you it's made in a little brewery, or one that implies their tasteless fizzy yellow beer will give you more sex appeal. Peraps you think multi-million dollar ad campaigns make a beer tates better. Perhaps you're mouthing your words as you read this."
(edit) Almost forgot
"Maudite" ("the damned one") if you like belgian-style ales, and
Steam Train Porter -- great beer, but good luck finding it, it's even hard up here near the brewery (I haven't had any of their other beers.)
If you like Fat Tire, definitely try some of New Belgium's other beers -- I like them a lot better.
1554 and their
Trippel being my two favorites.
A local restaurant up here runs "Brewmaster's Dinners" where they bring in a microbrew and they work with the chef to match the beer with the food. It's been great to taste some of the brewery's less well-known beers (my comment to the New Belgium brewmaster was "Don't take this the wrong way, but Fat Tire was the least impressive beer you brought." He said "Yup, it is -- we agree. But it sells well...")