I have four links I open every morning when I get in and I browse them during the day when I have a minute free here and there or just need to take a break from whatever it is I'm working on at the time and have a giggle.
www.boingboing.net (one of the bestest sites on the entire internet)
www.fark.com (horribly american, partisan and irritating discussions/link descriptions but a good source of news)
www.crooksandliars.com (lefty american political news source that I read mostly in the hope that they've posted a "Daily Show" or "Countdown" clip)
www.breakingnews.ie (generally rubbish but better than most)
boingboing.net and fark.com are the most fun to read in my opinion. Fark gets old pretty quick but theres a sense of delight to boingboing's newsposts that makes a monday morning something to look forward to (I make a deliberate point of never reading these at home in the evening).
I very specially avoid other news sources like indymedia and guerilla news network and all the other ones that like to link to stories about violent tossers acting up and calling it "civil disobedience" and obviously I'm not big on right wing american sites, regardless of how much funny they might post.