Currently I have a 2.2GHz MBP with 2GB of RAM. I normally work in Adobe Lightroom and Adobe Photoshop CS3 processing my camera RAW files. I normally am browsing the web via Safari and have iChat and Mail open, too. I was thinking of upgrading to 4GB of RAM but will I really benefit from the upgrade? I normally use my iMac to process my RAW files, but when I'm on the road, I like to do some quick processing on the go. So essentially, I'm not working in LR or CS3 all the time. I'm just trying to justify spending $100 or so to upgrade to 4GB if I really won't see much difference. I know these questions are posted often, so I do apologize in advance.