I have one Mozilla window open, on my lowest virtual desktop, with the following 4 tabs opened at all times...

• http://slashdot.org/
• http://www.perlmonks.org/index.pl?node=Newest%20Nodes
• http://inpassing.org/
• http://lies.com/

...at least a few times a day, when I want to take a quick break, I select "Reload All Tabs" and skim through them.