Woo, more tests... As always 280Mhz clock speed, ram timings on, no frameskip and sound and interlace off unless stated. All disk images used have been compressed with Pocket ISO 2.1 and tested with ePSXe to make sure they work.
Breath of fire 3 : (PSX Clock 40% Cycle 2.0) Game reports it is running at 70FPS! But seems to run about 30 at most times (not bad, but not 70 either) Played for about 30 mins with no lockups. Playable, but not full speed.
Diablo : Froze after *now loading* screen.
Legend of Mana : (PSX Clock 40% Cycle 2.0) Like most Square titles, this one runs OK (near fullspeed) at times when the PSX CPU is lowered. Very playable, even if a little bit laggy at times.
Loaded : Froze on Loading Bios.
Ogre Battle - Limited Edition : Got funky crash graphics, looked like a ZX Spectrum bombing, only more colourful
Pro Evolution Soccer 2 : Menu text was missing, so it was impossible for me to get ingame.
Suidoken 2 : Blank screen after clicking new game. The emulator does not freeze, and whatever is happening is happening at 30FPS.
Tactics Ogre : (PSX Clock 100% Cycle 1.0) No matter what clock and cycle counts I tried, the game ran at around half speed (25-35FPS), playable in some cases, but the obvious GFX lag and slower game play would prolly drive all but real fans of this game nuts.
Vigilante 8 : Froze on first screen after *loading bios*.
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I will probably start posting findings together in a thread on
http://zodttd.com/forum/ in the GP2X secton - just to try keep them all in one place and together -

It might help the other current psx4iphone users with settings.
[edit]
I did post to zod's forum, I just think its a better place for this kind of list, and I was bored so *shrug* see my sig for info.