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+I just learned that the new macbook airs and macminis have bluetooth 4. (21-july-2011) with the iPhone 5 rumored to contain it. Assuming that includes the low-power mode, the sensor network is finally here. Oh wait this is Apple - they'll neuter it before shipping.
+lowpower bluetooth4 is our best hope for spontaneous phone to phone discovery and messaging. (re: dating site)
+---
+Dec 2012
+Bluetooth 4le breakout boards
+  Client only
+  Chip: NRF8001
+  https://github.com/nabilt/nRF8001-Breakout-Board
+  Part: $2.50
+  http://www.semiconductorstore.com/cart/pc/viewPrd.asp?idproduct=46669
+  Master/client
+  Chip: BLE112
+  http://www.inmojo.com/store/jeff-rowberg/item/ble112-bluetooth-low-energy-breakout/
+  Part: $18
+  https://www.semiconductorstore.com/cart/pc/viewPrd.asp?idproduct=46652
+  TI CC2540
+  http://www.mouser.com/ProductDetail/Texas-Instruments/CC2540F256RHAT/?qs=sGAEpiMZZMsyM1rGGtQxrPlhStm%2fMGm9
+  TurnKey
+  $50 out of stock, new version arrives Jan 2013
+  http://www.inmojo.com/store/jeff-rowberg/item/ble112-bluetooth-low-energy-breakout/
+---
+March 2013
+NRF51822 $2.50
+http://www.semiconductorstore.com/cart/pc/viewPrd.asp?idproduct=47970
+With extra stuff? $13
+http://www.rfdigital.com/?targetpage=item&filterpn=51822
+breakout board
+?
+---
+April 2016
+smart bluetooth / BLE
+TI CC2640
+ATMEL ATBTLC1000
+http://www.atmel.com/devices/ATBTLC1000.aspx