I am thinking about upgrading my recently ordered 2.2 MBP to 4GB. While there have been 100 RAM upgrade threads, I don't think anyone has specifically asked this question. I am wondering what, if any, differences this upgrade will make with virtualization software, which I know are RAM intensive applications. Does anyone have any personal experience with this, before and/or after upgrade? I am not going to be using any special windows applications such as photoshop or video editing. I just want my experience to be as smooth as possible. Thanks!