Yeah, I just checked that slide card thing. Unfortunately, I have the newer "slim" PS2 and looking at the way it works, I don't think it would work with mine
I think I've got my older PS2 around somewhere, so I guess I could try that if I can't find anything else.
Edit: Looks like there's a version for the slim PS2 aswell, albeit with no instructions.
I found a No solder(dont gotta open) mod chip and swap magic bundle,you can play import games and back up games.Please before buying READ FOR DETAILS(duh) and its only 40 bucks together in the bundle. http://www.modchip.com/ps2/swapmagic.php here is the link,and again read before buying so you wont buy 1 thing you dont need.