Many of these links via mefi:
Cool photography of Afghanistan, 1970s through present.
Cheap things to do in the summer.
Single MST3k episodes can be downloaded from this site.
This day in history...someone was executed. Updated daily.
Yes, pacemakers can be hacked.
Calculate the solar potential of your roof.
This is pretty good at recommending new (mainstreamish) music.
Symmetrical photography from flickr - just click it and see.
This is a cool music idea - you buy songs, and as more people buy it, the "early adopters" get paid. Or something.