Lanair, don't bother looking for PS2/X-Box/Gamecube emulators.
1. The specs of these console games are incomparably high than the specs of regular PCs. Even if there was a miracle, you'll be running jerkily and stuff. (PSX games are playable tho on emulators)
2. There aren't any working emulators yet as far as I've heard. So searching for non-existant programs is a waste of time. What you'll find mostly are test/demo programs of possibly in-progress emulators. (Even DreamCast doesn't seem to have a working emulator yet, and THAT system is old.)
3. When and if you find the iso's for the games(DVD images of the original discs), are you going to be able to fit the 1-2gig file on your comp? Not to forget, it's probably in .rar form, which means extracting it first and crap... so a minimum of 3-4gigs.
Why I'm saying this? Because I've done the same thing a few years back, when .hack games came out for PS2. Actually managed to download an entire game(I think), but never found an emulator. Ever since then, I did occasional searches for PS2 emulators.
The most reliable sources for emulator information are game forums. NOTHING ELSE. Every site you find in searches except forums are sites that only look for hits. You'll be wasting your time clicking them.
Example:
this forumhere tooanother 
