In short, no.
If you're handy with cutting tools though you can cut them down to the right size, although this wouldn't look how the manufacturer intended and it might not look right.
No PlayStation 3 games do NOT work on the PlayStation 2 system.
No they do not work in a PS2
No.
no
The original Sony 8MB memory cards (for PlayStation 2) work best, but any memory card will work in the PlayStation 2 Slim
You can do 1 of 2 things. 1. If you haven't already bought inFAMOUS 2, get the Hero Pack instead of the regular. It will include all skins. 2. Look for a [reliable] code generator. Generators will give you a code to put into the Playstation Store to get skins. I only know that you can do the Reaper skin with gens. I don't know if this will work for Sly's Cane or Caveman Club or any of the others.
yes
No.
no
Yes.
Yes they can.
no, but you can play playstation 1 games on a ps2