Hi Everyone, I'm just curious as to when it is a good idea to upgrade to 4 GB. I am not a heavy user, mainly using Firefox, Yahoo Messenger and iTunes almost all the time and then a combination of MacSword, Pages, Keynote and Numbers (not all 4 at the same time). Would it be worth it for me to upgrade to 4 GB? Would I see an noticeable difference? I plan on keeping my MacBook for a few years, so I would probably upgrade at some point. I am just wondering if would be worth it to do sooner rather than later. Thanks for your input!!