JeeLink (v2)
The JeeLink is a small module in the shape of a USB stick, with an Atmel ATmega processor and a HopeRF wireless radio.

Note: the previous JeeLink version (JL1) has a different form factor and is now called a JeeNode USB.
Differences with the JeeNode USB:
- different form factor, enclosed in a plastic case
- no pins or port connectors to attach anything to
- includes 1 Mbyte of flash memory, connected via SPI
- uses a 10 ppm crystal for improved time-keeping accuracy
- no reset button
HOW TO GET IT
Pre-assembled units and boards are available in the Jee Labs Shop at:
http://shop.jeelabs.com/products/jeelink
You can also create your own boards with these CadSoft EAGLE design files:
http://jeefiles.equi4.com/jlpcb-030.sch
http://jeefiles.equi4.com/jlpcb-030.brd
Schematic as PDF: http://jeefiles.equi4.com/jlpcb-030.pdf
Dimensions: 19 x 49 mm (board), 23 x 71 x 8.7 mm (enclosure)
Everything is provided as open source, both hardware and software.
HOW TO USE IT
A JeeLink is mostly the same as a JeeNode so have a look at the JN4 Tips page.
OTHER RESOURCES
All related weblog posts are listed at http://news.jeelabs.org/tag/jeelink/
Check out the forums at http://talk.jeelabs.net/ for further details and support.
SEE ALSO
The JeeNode lacks the on-board USB port and memory, but is more extensible and available as kit.
The JeeNode USB lacks the 1 Mbyte flash memory, but is more extensible and available as bare PCB.