Largest Memory Card Available?

[BQuicksilver]

Just curious, what's the largest memory card that you can buy for a PS2 that doesn't require any special boot procedure such as loading with an AR or Gameshark? Please provide links.

Also, have any of you had good luck with any system that allows USB transfer of saves to your computer HDD? Which systems work and why?

Any advice would be very welcome, thanks to all!