The more memory the better. If your computer has to swap to virtual memory a lot, your battery life will suffer as the Hard Drive will never be able to spin down. A new Control Panel that you might want to check out is File Synchronization. It allows you to sync up common files to a server or you your desktop computer. It will detect changes on both sides and copy files so that you are using the newest one on both machines.
Rubberized surface Be careful, it scratches easily.
The rubberized surface is very thin. I already have a nick on mine. I used a black Sharpie to cover the exposed shiny surface underneath. It was just a tiny nick though. I still haven't found the correct shade, the Sharpie is a bit too purple.