John Galloway wrote:
Seen this?

http://www.flarm.com/index_en.html

Radar and transponders are just so 20th century.

They are, that is why ADS-B exists:

http://adsb.tc.faa.gov/ADS-B.htm

Unfortunately, ADS-B shows all of the signs of being a classic case of
design by bureaucracy. As for FLARM, it's not clear when, or if, they
will get (communications) regulatory approval for use anywhere other
than Switzerland.

Marc