Well... I just upgraded to 3.90m33. The nice thing about the newer M33 firmware, is that you can just simply use the standard "Network Upgrade" feature on your PSP, and it will automatically get you the latest m33 code (just like doing it thru Sony).

I just spent a few minutes last night going from 3.80-m33-5 -> 3.90-m33. On the slim, it adds support for Skype. I don't believe this works yet with the fat model. Haven't tried Skype yet, but everything else is working fine.

Also downloaded a few games (MX vs ATV, Ben10, Atari Classics, and a NES emulator with 800 games) and those run fine. Joe, I'll hit you up about getting some more titles.