Crawling From The Wreckage
Minus is a comic about a little girl with the power of God. Kind of a cute watercolor Peaksville.
Bang Barstal tells the story of a man in post-Apocalyptic (not merely post-apocalyptic) America who wields Excalibat.
Gone With The Blastwave reflects the endless fighting of differently-colored videogame-like armies.
Dresden Codak has absolutely beautiful art and an absolutely implausible protagonist - a pretty nerdy girl that can't find a date.
Gunnerkrigg Court has robots. And griffins, I think. Not robot griffins.
And, finally, XKCD shows you don't need good art to make terribly nerdy jokes.