i'm on the minority, but i find that the craigslist UI is pretty good. all the "flows" work pretty well and are well explained. i hope that doesn't change and that all they do is make the site easier to read.
I agree, but I think some of that might boil down to different priorities, rather than design per se. EBay hasn't slowly turned into the rather annoying mess it is because of incompetent design, but imo mostly because of aggressive monetization, which hands non-negotiable constraints to their designers. Craigslist just doesn't care about monetizing beyond their comfortable income level, so there's less push from management to compromise the design. As a result, it might be possible for them to create a "Web 2.0" looking site without pulling in the bad aspects of other sites, because the bad aspects are due to the aggressive monetization rather than to the Web-2.0-ness.