I've never had 2GB before, but for $34 a GB, how can you not 
My wife couldn't figure out a good father-to-be gift for me. I explained to her that I would be doing a lot of video editing on the laptop once my boy comes along, so extra memory would be great! I looked it up for her and such....I was extremely surprised to see the current prices! I was going to go for 1GB, but for the price...it was easy to talk her into 2GB
I think I will notice just a bit of difference going from 512MB to 2GB on this 2ghz core duo macbook 
My wife couldn't figure out a good father-to-be gift for me. I explained to her that I would be doing a lot of video editing on the laptop once my boy comes along, so extra memory would be great! I looked it up for her and such....I was extremely surprised to see the current prices! I was going to go for 1GB, but for the price...it was easy to talk her into 2GB