Ruka has posted details of a beta version of his Nes Emulator for the PSP, this release has Support Wifi Network Play(Adhoc) & Run in Kernel mode.for PSPs with firmware versions 1.0 or 1.5. If u can believe whats written on the site (its Japanese)
No Download yet but keep your eye on the site here --> http://rukapsp.hp.infoseek.co.jp/