I'm gonna post my "standard list," so there might be some overlap with what's been said so far.
Breath of Fire III, Breath of Fire IV
Chrono Cross
Clock Tower: The First Fear, Clock Tower, Clock Tower II: The Struggle Within
Crash Bandicoot, Crash Bandicoot 2: Cortex Strikes Back, Crash Bandicoot 3: Warped
Dino Crisis, Dino Crisis 2
Dragon Warrior VII
Final Fantasy Origins, Final Fantasy Anthology, Final Fantasy Chronicles, Final Fantasy VII, Final Fantasy VIII, Final Fantasy IX, Final Fantasy Tactics
Lunar: Silver Star Story Complete, Lunar 2: Eternal Blue Complete
Parasite Eve, Parasite Eve II
Resident Evil: Director's Cut, Resident Evil 2: DualShock Ver., Resident Evil 3: Nemesis
Revelations: Persona, Persona 2: Innocent Sin, Persona 2: Eternal Punishment
Spyro the Dragon, Spyro 2: Ripto's Rage, Spyro: Year of the Dragon
Tales of Phantasia, Tales of Destiny, Tales of Destiny II
Tomb Raider, Tomb Raider II, Tomb Raider III: Adventures of Lara Croft, Tomb Raider: The Last Revelation, Tomb Raider: Chronicles
Vagrant Story
Wild Arms, Wild Arms 2
And if you're only emulating, you can add in hacks.
- Un-Worked Designs difficulty reversion patches for Lunar 1 and 2 Complete (Actually, you might only want to use Lunar 1's patch; WD didn't change much in the US release of Lunar 2 Complete and the Un-Worked patch is busted on real hardware)
- Resident Evil: Ultimate Director's Cut hack
- FF Tactics: The Lion War hack
- Tomb Raider I "Last Secret" fixer hack
- Fan-made conversions of Tomb Raider I and II's PC expansion packs (Unfinished Business and Golden Mask, respectively) to PS1
- I recommend Phantasian Productions' fan translation of Tales of Phantasia, but don't sort the Collector's Book alphabetically or it'll crash