If anyone wants to tackle those, be my guest. I've been firmly planted in the "Blissfully ignorant of Psi in D&D" camp for about 20 years.
Presto2112 (& Hobo & FentonGib & LordVyreth),
Over on the Paizo message boards, someone posted a PF update for the four base classes in XPF. I DL'ed it; not too bad, especially considering the fact that I am too lazy to work on those. Just do a search for psionics & it should turn up. (I just went there to do a search, but the site is temp. down.)
LordVyreth,
As well, I think someone else also updated the elan there. Myself, I converted it into a template (along with aasimar & tiefling). Still kept the +1 LA.
Other stuff I've done (or have started to) are updates for dragon shaman, dragonfire adept, favored soul (just threw the sorcerer's bloodline into it & added orisons), hexblade (including adding Mike Mearls' suggestions for regular 3.5 revision), marshal, & warlock (ripping off an idea from another poster on Paizo). The hardest part for me is adding a capstone ability.
I like the basic idea behind the swashbuckler that's in another thread here, but I'll tinker with it a bit for my group (decrease the number of bonus feats & talents, but upgrade Fort back to good).