No runner-ups in this round, then? Well, let's see...
Post of the Year: Glorb's request.
Topic of the Year: You know what... I think I'll change my vote to "Why don't any of you people have A Boy and His Blob" this time. Granted, the thread itself wasn't that interesting, and the spin-offs got pretty annoying, but it's still very significant in that respect. I enjoyed YA,YL more, but it was just another game thread riding on the coattails of its own fad (and one which tends to bump shoulders with YGA,YL). I never followed the other three nominees.
Post of the Decade: "Eye Puff Angst" was great (my brother and I actually quote it back to each other every now and then), but I have to hand the nomination to Trainman's Wikipedia article, for sheer craftsmanship.
Topic of the Decade: My harem, of course.
Also, I just realized I completely forgot to nominate Mario d20 for Topic of the Decade. And I also forgot about MaxVance, but I guess that doesn't matter right now.