I'd heard Ward Cunningham had left Microsoft, but now I've found confirmation.
I first heard the confirmation on Bill's blog, Mini-microsoft on Ward Cunningham. It points to Goodbye Ward, which points to So Long Ward!. It's also on Waynes blog, I couldn't be more excited!, which links to Ward Cunningham Joins the Eclipse Foundation. Also see "Father of Wiki Quits Microsoft; Moves to Open-Source Foundation"
Ward is an influential guy wherever he goes; Microsoft will miss him. He invented wikis, helped invent software patterns start the PLoP conferences, helped make CRC cards popular, started PatternShare, and a lot more. He even has his own Wikipedia page.
Ward has now gone to Eclipse, obviously one of IBM's favorite open source groups and one that seems to be on the move these days. They've also just hired Wayne Beaton.