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The occasional game:
http://mathsnet.net/geometry/solid/houses.html (java required)
http://www.gamedesign.jp/flash/dice/dice.html (flash required)
http://www.bubblebox.com/play/action/1522.htm (flash required) (personal record: 186 seconds)

News:
http://heise.de/newsticker/ (German)
http://heise.de/english/newsticker/ (English, less articles)
http://lwn.net/
http://programming.reddit.com/
http://osnews.com/
http://kerneltrap.org/
http://lambda-the-ultimate.org/

Music:
http://last.fm/
http://di.fm/
http://www.bluemars.org/
http://somafm.com/ (try Groove Salad!)
http://www.deepmix.eu/ (Minimal music)

Other:
http://plato.stanford.edu/

If you don't have time for a daily newspaper:
http://www.harpers.org/
http://www.csmonitor.com/

Two cool things to read, if you are security-minded, are:
Forum On Risks To The Public In Computers And Related Systems
The Crypto-Gram Newsletter
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