I discovered Alice Neel's stuff back in fart school. She's unquestionably a "fine artist" and not a cartoonist, but her work is so wonderfully caricatured and wonky and vibrant that I feel I can justify plugging her here.
Here's her official website, which includes an extensive gallery. Check out her work from the 60's and 70's.
Before I started this blog I used to contribute to one called The Association of Disaffiliated Artists. Yesterday I was bored so I decided to look through my old posts. I find a lot of it embarassing now, epecially the attempts at celebrity caricature, but I still dig some of the wacky doodly stuff I posted. Here's a very brief "best of" my contribution to T.A.D.A.