Since he's on an Oz theme, here are my guesses for who we will meet:
Wally = Cowardly Lion (needs courage)
Alice = Tin Man (needs a heart)
Pointy-Haired Boss = Scarecrow (needs a brain)
Carol (the secretary) = Wicked Witch of the West
Asok = Winged Monkey
The Genius Garbageman = Oz
There's a widget, at least, for OS X. I guess it wouldn't be that hard to create a screen saver, esp. if there is already one that can do web-based images... 🙂