Hi everyone! I know this question has been posted a lot of time, but I did a little bit of research on the forum and read all the 14 pages that had something to do with ram (when searching "ram" on the forum), but none of these posts did really answer my question :/. I have a unibody macbook pro 2,4 GHz, the one from Oct 08 with 2 gigs of ram, and i'm still not sure if a should update to 4 gigs or not. I use my macbook pretty often (couple of hours a day), firefox + itunes + skype + msn open kind of 24 for 7, and quicktime + iphoto + imovie + preview + Adobe reader also open very often. (all at the time sometimes). (I will also upgrade to SL when I'll get it from Apple!) So i wanna know if it would make a big difference if I update my ram (from 2 to 4 gb)! Right now i have 1,7 gigs used, 1 gig activ, 600 mo passiv, 30 mo free (on my monitor) Thanks in advance for your answers! =). P.S. : I'll be happy with just one good link that matches pretty much my question, I couldn't find the right one for me!