Playstation 3... :))))))))?

How can I get more memory for my playstation. I have the very first PS3 that was released (the big fatty one, lol). Someone told me it should have a memory card slot, but I don't see one. Also, is it safe to take a part and clean with a can of air duster? What are some good games? If you play COD: Blacks Ops and wanna play with me add miss-ashley08