shoutingboy linked to an Abstruse Goose comic on Facebook, and I clicked through and ended up reading the whole archive. It's very xkcd-esque (although
here's what the creator has to say about that). It's more math-oriented, so there's a slightly higher percentage of strips I don't get than in xkcd, but I've been enjoying it anyway.
A few of my favorites:
SETI Finally Receives a SignalLiveCommentJournalWhat's in a Name?Family ReunionAlice and Bob (all together now: n'awwwwwwwwwwww)
Electromagnetic LeakTravelingArtificial