Yahoo co-founder Jerry Yang may be unable to give up his web-based baby, but Flickr's co-founders Caterina Fake and Stewart Butterfield (who are married) don't seem to have that problem. According to TechCrunch, "Fake officially left last Friday. Butterfield (who still officially runs Flickr) will leave on July 12."
This is a little different from what TechCrunch calls "the mass exodus" of Yahoo executives because they haven't been tempted away by all-you-can-earn job offers from Google or the chance to make millions via a start-up. They already made millions when they sold Flickr to Yahoo (and it couldn't happen to nicer people).
It will be interesting to see what they try next, though that may not matter -- many of the big successes are accidental. Butterfield and Fake were developing an online game when they stumbled into Flickr, and Ev Williams was trying to transform podcasting (via Odeo) when he came up with Twitter (originally Twittr). Google was trying to do a search engine when it stumbled into becoming the world's dominant advertising platform.
Update: Valleywag has posted what purports to be Stewart's resignation letter,and if it's genuine, it's either funny or mad. But as SeattleBuzzKill says in a comment: "Laugh all you want you no-having-35-million-mother-phuckers. See his babe wife too? I wanna be crazy just like that."