Since it's the end of the week, here's a mindless fun mashup recently added to our listings that will help you kill some time: DiggKiller. A 2-D shooter game built with the Digg API. Kill the Diggs on enemy stories and collect comments for powerups.
Creator Kurt Margenau even gives you the source code for it. And although it has a high scores table, Kurt notes that: "yes, I know my high score table is totally hackable by intercepting the http requests, and yes you could blow up my db if you wanted, but come on... don't be a dick."