Just don't call it WWF ;-) anyway I can finally talk about this really cool new technology and the new site dedicated to it; essentially this replaces all the little workflow bits you've written oven the years. A colleague of mine Morgan Skinner has also written a great little introduction article on writing custom activities on Windows Workflow Foundation (will someone PLEASE figure out an official abbreviation!). It's also really worth taking a look at the fantastic article by Dino Esposito on how this stuff works...
Have you any idea of the time this would've saved me in my previous life...damn it!
UPDATE: Umm...this is Morgan...nuff said!