If he doesn't overstay his welcome, how about Dean for HHS Secy?
I know the popular thinking is Edwards for VP, but my top choice for Kerry would be BILL RICHARDSON if he wanted it. Bright guy, guv of NM, former Ambassador...he'd help tap the underrepresented hispanic vote big time. Bush has made some inroads there but Richardson cpuld turn that around and probably getthose who've never voted. Geographically he could also in Arizona which could be a huge pickup, and also other Western states.
Edwards could maybe be Attorney General if he wanted.
What a great Admin this is going to be replacing Bush.