Not yet if we can trust IGN:
PSP only for now:
* Ikasama Mahjong (Idea Factory)
* CG Mukashi Banashi Jiisan Ni-do Bikkuri (Idea Factory)
* Yaku Tsu Noroi no Game (Idea Factory)
* Lunatic Dawn III (Artdink)
* A5: Take the A-Train 5 (Artdink)
* Metal Slug X (SNK Playmore)
* Real Bout Garou Densetsu (aka Real Bout Fatal Fury, SNK Playmore)
* Kenkaku Ibunroku Yomigaerishi Soukou no Yaiba Samurai Spirits Shinshou (aka Samurai Showdown Warriors Rage, SNK Playmore)
* Bakumatsu Roman: Gekka no Kenshi (aka The Last Blade, SNK Playmore)
* Garou Densetsu Wild Ambition (aka Fatal Fury Wild Ambition, SNK Playmore)
* Fushigi Keiji (Capcom)
* Philsoma (Sony)
* Jigsaw World (Nippon Ichi)
* Wai Wai Tennis Plus (Hamster)
Update for older titles which makes them playable on PS3:
* Spectral Force (Idea Factory)
* R-Types (Irem)
* A.IV. Evolution Global (Artdink)
* Resident Evil Directors Edition (Capcom)
* Bishibashi Special (Konami)
* Arc the Land (Sony)
* Ore no Shi wo Koete Yuke (Sony)
* Gunners Heaven (Sony)
* Ganbare Morikawa-kun Ni-go (Sony)
* Marl Oukoku no Ningyou Hime (Nippon Ichi)
* Tekken 2 (Bandai Namco)
http://ps3.ign.com/articles/783/783271p1.html