Wikipedia has a Mac timeline that is sweet! You can view all of the Mac’s made since the beginning of Apple. Click the link and get the Wikipedia page for that model. It’s pretty neat!
Now the browser wars will get hotter as Opera turns up the heat now that it has removed all banners and registration requirements. You can download it from their web site.
MacWorld has a good article on modding your Mac. Complete with links and more on how to do it, who should do it and why. Worth the listen.