My Albook is coming with 512megs of ram using up both slots(those bastards), is it worth it to upgrade up to 1 gig of ram? I had 1 gig in my ghz tibook and loved it, not that I knew any different since it came with a gig. However what is the speed/responsiveness increase from going from 512 to 1 gig of memory in OS X? Anyone have any personal experiences?