I wrote a little article for PC Pro around the concept of short range RF data. It covers Arduino based RFM12B, Jeelabs, and even OEM.
Hopefully some will find it interesting.
And hopefully you won't find too many errors!
http://www.pcpro.co.uk/realworld/380878/hack-your-own-radio-transmitter
(Sorry for the clumsy page title - that was the only bit I didn't write! Apparently stuff like that is good for search engine visibility)
P.
Re: Might be of interest
Nicely written and very easy to follow.
This is just what I need. I shall have to look at your other contributions on PCPro....
Thanks Paul.