At long last, I finally spent the $20 to bring my eMac from 1.5 to 2 GB of RAM! I put it off for so long because I really didn't think it would make that much of a difference - Activity Monitor showed that I wasn't even close to running out of memory at 1.5 GB. But wow, the extra half-gig actually gave a very noticeable performance boost - namely, both iTunes and TenFourFox have much smoother scrolling, and switching between them and the desktop is instantaneous now. TFF also is much quicker switching between and opening new tabs. Needless to say, I am very pleased!