Never Enough Extra RAM Department

For my birthday this year, I asked my friends for new RAM, so that my crawling 256Mb machine might be a bit more responsive. It came today, and now I'm running at 768Mb--3/4s of a gigabyte--and using Firefox with iTunes. That may not sound like much, except previously the combination would bring my machine to a crawl. Now it's flying. Have I mentioned that I like my friends a lot? Or that RAM is cheap and easy to install?