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I don't think it being spec'd at 5400 would be a problem (higher speed is okay, because it's backwards compatible) but it's 240-pin, which is the wrong size. You need 200-pin.

Edit: Beaten to the punch!
 
outpost.com usually has good deals. what iteration of the mb do you have?

It's a Blackbook 2.2 w/ standard configuration. Thanks for the info, going to get myself 4gb in the near future. Looking forward to the increased performance that will bring forth.
 
try the crucial site :)

Yeah, definitely crucial. I just bought 2 x 1GB sticks from them for my santa rosa macbook, only $56!. I discovered that crucial ram is micron's US manufacturing wing for direct sale to the public. The ram that the macbook came with is from micron, so I have no doubt that it's good long-lasting ram.

Shoving it in is a b**ch though, and I have small hands. I always think I'm going to shove the ram right through the logic board.
 
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