PSX (PSN Titles) on PSP:

Chrono Trigger (PSN on PSP)
Final Fantasy VI (PSN on PSP)
Castlevania Symphony of the Night (PSN on PSP)
Crash Bandicoot Collection (PSN on PSP)

PSP:

God of War Ghost of Sparta
Soul Calibur Broken Destiny
Final Fantasy Dissidia Duodeciem
The 3rd Birthday

PS2:

Tekken 5
Final Fantasy XII International Zodiac Job Edition (translated)
Street Fighter Anniversary Collection
Tekken Tag Tournament

Sega Dreamcast:

House of the Dead 2
Crazy Taxi
Soul Calibur
Tony Hawk Pro Skater 2
Jet Grind Radio
Sonic Adventure 2