My tops:
1) Sierra Nevada Harvest Ale (fall 2007 version) - unbelievable fresh hop taste and aroma
2) St. Ambroise Oatmeal Stout - very unique mouthfeel similar to Mackeson XXX
3) Avery IPA - This is a fantastic IPA, but I had a dry-hopped version of this at the Avery Brewery tasting room in Boulder, CO and it was out of this world
4) Dogfish Head 90-minute IPA - Extreme hops balanced by malt like no other I have tasted.
5) Ayinger Celebrator Doppelbock - A malt lover's dream along with a goat trinket bonus!
6) Ayinger Octoberfest Marzen - A great representation of this style, and it has a cool miniature painting on the bottlecap!
7) Oskar Blues Old Chub Scotch Ale - Canned beer at its best. The dash of smoked malt gives this one a phenomenal complexity without overpowering smokiness.
8) Olfabrikken Porter - Even the $8 price-tag for a 14 ounce bottle cannot keep me from revisiting this beer. By far the best porter I have had.
9) Avery The Kaiser Imperial Oktoberfest - a unique style captured in a unique way. Usually benefits from some aging.
10) Rogue Dead Guy Ale - I always come back to this one for a complex, balanced semi-session type ale
These are just a few of my favorites. Of course a lot of the previously mentioned candidates are stellar - Samuel Adams Boston Lager, Sierra Nevada Pale Ale, Anchor Steam, Pilsner Urquell, etc. And despite my taste for the finer ales and lagers, I can still throroughly enjoy some of the more traditional lighter fare such as Bud (Select is particularly tolerable), Michelob Amber Bock, etc.