Google has a 'supplemental index' - a secondary index for when they cant find the answer to a search in their real index. FYI -- My forumhome, which got its PR 6 this last update, still isnt cached.
Thanks for the reply. I've since seen the term mentioned in other posts and apparently it's not really news to anyoone. My question, then, is: why have two indexes at all? Why bother with having a two-tiered indexing system? Creating some kind of 'index ghetto' is going to really piss off a lot of developers, I think. Or am I looking at this wrong?
i feel that G have intentionally screwed up their index and cache results like they did with link:. This has been done to discourage link building schemes like coop, lv etc which rely quite a bit on these. But then its my personal opinion.