I bought an old 500MHz iBook G3 (2nd generation, the white one) off eBay just for portability around the house. Which my iMac obviously doesn't offer. Anyways. I'm really happy. It's pretty speedy for 500MHz, but I notice when I'm typing on certain websites (MySpace, Twitter, etc), the keyboard kind of lags. Like right now it's really good, but when I want to post a tweet on Twitter or post a bulletin on MySpace it lags. I'm upgrading my RAM, it's on it's way in the mail. Could this fix this issue or is it the processor?