My single favorite online show. I ran for 5 seasons.
Pretty much, a bunch of guys got together and acted out scenes (with some special affects) using Halo and did voice overs.
It's about two armies, the Reds and the Blues, stuck in a box canyon. The cast is great and the dialog is funny as hell.
One of my favorite exchanges:
Doc: I'm a pacifist.
Caboose: You're a thing that babies suck on...
Tucker: No, dude, that's a pedophile.
Church: Tucker, I think he means a pacifier.
Tucker: Oh yeah, right. Man I was... totally thinking about somethin' else.
Church: That’s real classy, Tucker.