My impression was that the Hubert trail started at WhoIsHubert.com (to which you were led by TUAW) and wound it's way through a number of sites. The trail is still doable, though not in its original form.
The current trail goes: WhoIsHubert -> MDA -> Xeric -> WidgetMachine -> EmbraceWare -> PhillRyu -> WhoIsHubert (Don't Touch Me version)
A few of the pieces I know to be removed are: Potion Factory, iUseThis, and Unsanity. There are a few more missing pieces, but what they are currently escapes me.
BTW - great thread AEnima!
-- epochblue rolls with a 15" 1.67Ghz PowerBook G4, a 20GB 4G iPod, and a 2G shuffle.