Tekken: Dark Resurrection was one of the better fighters on the PSP. In fact it is the only fighter title worth considering if you are not into retro fighters. Which is a darn shame considering the title is almost three years old.
Well wait no more. According to the internet, Namco is releasing Tekken 6 (and Bloodline Rebellion) for the PSP, which they promise will contain plenty of those features unique to the PS3 version. This includes character customisation and ad-hoc wireless multiplayer.
Better yet is the announcement of Soulcalibur: Broken Destiny. Unlike the broken Wii abomination Soulcalibur Legends, the PSP game here is said to be based on Soulcalibur IV, which I found to be a rather nice game. It will also apparently feature ad-hoc wireless multiplayer.
Now, what about a decent portable Street Fighter for a change, Capcom?