Multiple home pages in your browser

One of those things that not many people know, most modern browsers these days allow multiple home pages.

Firefox/Flock

Internet Explorer

Opera also allows you to do it, quite a bit more complicated, but can be done

Multiple home pages in Opera

In Firefox/Flock there is also an extension that allows you to cycle your home pages:

Home Page Cycler
Load a different home page each time Firefox starts.