From a ConWebWatch reader:
Just read your bit about Matthew Sheffield's comments regarding Wikipedia and thought you might be interested in a few other areas where the left-vs.-right issue has come out. I'll mostly focus on Arbitration cases that have arisen in the last year or so that might be interesting to you.
First off, you may find this entertaining - it is an Arbitration case that banned Matt Sanchez, aka user Bluemarine, from the site for egregious conflict of interest, homophobic slurs, and general obnoxiousness. Click into the Discussion page to see more comments, and I'd recommend looking at the subpages as well - it's quite the entertaining read.
Free Republic has been a long-standing battleground; the FR arbitration thread was rather enthusiastic as well.
Waterboarding - is it torture or not? This is somewhat linked to the above Free Republic issue - one of the participants here is probably a sockpuppet of the central figure in that case.
Rachel Mardsen has been a regular source of irritation as well; I'm sure you heard about the recent flap over Wiki founder Jimmy Wales and she having a fling and her doing her usual thing after he broke it off, but the article has a long history, including another Arbitration case that I believe is linked from its talk page. The article was once deleted, restarted, deleted again, restarted, and has been regularly "massaged" by certain users with a conservative bent - if not Marsden herself, then close supporters.