Nothing. We have started to convert some monsters as part of the podcast, but in terms or spells or classes?
Nothing. The power creep and the broken nature of many of the later additions of 3.5 is what we were trying to escape when we moved to Pathfinder. Bringing along the broken stuff into a game of Pathfinder made no sense. We started playing Pathfinder to ESCAPE that 3.5 material in the first place.
What is the difference in Trailblazer rules?After deciding that I dislike iterative attacks enough that I don't wish to ever use them again in a game I run, I think I'll adopt the Trailblazer iterative attack rules should I run PF in the near future.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.