I will likely continue buying some of Paizo's 3.5e stuff, but I have no intention of buying the Pathfinder RPG or any Paizo material that compromises 3.5e compatibility in any way at all. And that means, no, I won't consider using conversion documents or free online material to use Pathfinder RPG adventures. If the adventures can be run with 3.5e without any significant work at all, they are still possibilities.
I do plan on purchasing 4e and 4e products, since I like the looks of the new game. I have no enthusiasm at all for a 3.75 edition that is close enough to 3.5e to claim back compatibility, but in practice is a nuisance to use material for because of *just enough* changes. So I'm hoping that the Pathfinder RPG is 3.5e with the serial numbers filed off, so I can ignore it entirely.
At this point, with Iron Heroes, Arcana Unearthed, WotC's own variant house rules, the Conan d20 RPG, True20 all on my shelf, I'm all in on 3e-ish rules sets.