I plan on adding to this list...check back later to see what I've missed.
Chickweed Lane: chickweed_comic
For Better Or For Worse: fbofw_feed
Get Fuzzy: comic_getfuzzy
Pearls Before Swine: pearlzb4swine
Rose is Rose: roseisrose_feed
These are just the ones that I'm aware of now. What other ones have been removed from the site's syndication feature?