Saweet. I just got 1 GB of RAM from crucial for my new 15" powerbook, and it works flawlessly so far. Its like a whole new world. Everything is very zippy. I had 512MB of RAM that came with my powerbook before this, but the crucial stuff seems to have given it a definite speed boost. I was kind of skeptical whether OS X would use the extra RAM if it had it available (I know my Windows box sure doesn't... anything over 300 Mb goes right to the page file... stupid windows.) Anyways it seems that OS X will gobble up RAM if it's got it available. After starting up all my favorite apps like iMovie, iPhoto, Photoshop CS, etc. I am very pleased to see that it'll use it if it's available. So cool. I'm also very pleased with how easy the RAM was to install. I can't believe that people pay to have RAM stuck in it was that simple. Almost dummy proof really. So what do you guys think? Should I sell my 2x256Mb sticks of RAM that Apple included with the book when i got it? How much do these usually go for round these parts? Bring on the Tiger and CoreVideo!!! Now that I've got 1GB of RAM I'm as ready as I'll ever be... buahaha.