I now proudly present to you drfun, a feed of the Doctor Fun page (or, more precisely, the "this week" page). The feed shows the last fifteen cartoons, regardless of how many are on the current-week page, by caching older entries.
Dave Farley knows about it and has kindly put a link at the top of the Doctor Fun main page (as well as small pointers inside the last two images -- cool!). So this feed can definitely get an N in the feed list.
Doctor fun is a daily (Mo-Fr) one-frame cartoon with sometimes wacky (and occasionally possibly offensive) humour. Try it and see whether you like it; it may not be everyone's cup of tea. (The FAQ says "Doctor Fun is a cartoon, single-panel, with a wacky gag and colorful artwork. Not all Doctor Funs may be suitable for children and some childlike adults. There's a new Doctor Fun every weekday. What Doctor Fun is, for the literal-minded, is a 640 x 480 pixel 24-bit color JPEG file.")
An archive is also available if you want to explore past strips.