I have a long standing fascination with homebrew radiation detection and measuring equipment, so the concept of the iGeigie (a Geiger counter that connects to your iPhone) intrigues me. (The iGeigie website doesn’t appear to be working at the moment, but here’s a link to a Make: Online blog entry.)
I’m also pretty fascinated by what Safecast is doing.
And by this older Make: Online homebrew Geiger counter schematic.
And this summary of Geiger counter kits and projects.
Yes, I think I will throw a few dollars at Safecast’s Kickstarter project, thanks for asking.
(Hattip: Wil Wheaton.)