http://www.instructables.com/ex/i/7DBB34EAEDFF1028A1FC001143E7E506/
Think the most expensive part would be the batteries.. the other parts can be purhcase or found cheap..
Might be fun at a party
In the video, they're throwing the Throwies up against a wall of what looks like an apartment building, and they're sticking... How many apartment buildings do you know with "ferromagnetic" (ie metal) walls? :shock:
Maybe the walls are just... sticky!
These wacky folks have a *lot* more coolness to peruse: http://research.eyebeam.org/projects
For example, a contest (?) to come up with the most contagious website/marketingcampaign! http://showdown.contagiousmedia.org/