I find it odd that, while Lost Planet 2 for Xbox 360 supports system link/LAN, the PS3 version does not. At least there is no mention of it in the manual and no slectable connection option when starting games. Maybe Capcom would release a patch.

MGS: Portable Ops is an awesome game but you'll have some catching up to do for online play. A lot of the people playing online have been doing so since day one. And when you enter a game get ready to see "X killed Y Headshot" a lot. There's a lot of hacking as well - people running around with superhuman characters who have high states and health. It kind of ruins the game.

I can't comment on Syphon Filter because I don't have it. The demo's nice, though. If I had some extra cash lying around I'd pick it up.

THE RED STARmarukazz

Metal Gear Solid 2:  Substance.  I beat the story mode at least 2 or 3 times a year.

Guardian Heroes.  I just keep playing it over and over again... I'll try to take it out of my Saturn only to sit down for another 2 hours with it.

Wipeout XL

Gran Turismo 2

Any of the Street Fighter 2s/Alphas

Tekken 3 

I'll add more as I think of them. 

Armored Core 2

Armored Core 3

Dead or Alive 2 (still own)

Oni

Zone of Enders 

Metal Gear Solid 2:  SoL (traded up for Substance)

Metal Gear Solid 3:  Subsistence (still own)

Gran Turismo 3

Gran Turismo 4 (still own)

Tenchu:  Wrath of Heaven

Automodellista

The Path of Neo

The Red Star (still own)

Odin Sphere (still own)

I think that's it.  I'm sure I'm missing one or two titles.  I went a step further and noted the titles I actually still own.

The Capcom collection (first one I think) has all of the 194x games. And a few other obscure shmups to fill out the rest of the package.

Hmm.... the last game I 1CC'd was Metal Gear Solid 2 on hard.