Definitely the best game I've ever had the pleasure of playing. I lusted after this game for a number of years, until finally (and luckily) stumbling upon a pristine collector's copy at my local GameStop (for $20). Upon leaving the store, I was given a hero's send-off by other customers: "ICO is such an awesome game, man! You're going to love it!" "Nice find! Killer deal on that copy! You'll love it!" Completely and utterly worth paying artificially-inflated prices, in my opinion.
Man, now I feel like calling off of work and playing through it again...
Either way, Sony needs to get on releasing a remastered collection of the Team ICO games on the PS3. If we could get some grown-up artwork this time around, I'd appreciate it. Because, despite being the best video game ever conceived, ICO has some NES-Mega Man-quality box art.
Good luck to anyone still trying to track down a copy.