Tired of the same old website popping up every time you open your browser? Try out whatpage. This service lets you pick as many URLs as you like, then set your home page to whatpage.org. Then, every time you open your browser, you home page will rotate among the URLs you specified. It's Web-based so there's nothing to install.

A nice feature to add would be a Stumbleupon-like feature that would load different pages based on similarities to your pre-selected URLs.