Do People Create And Sell Sketches?

westfw:
Doable. Popular, even. There are some specialized Arduino clones that make it easier, like Funnel IO ([url=http://funnel.cc/[/url] or JeeNode (not a zigbee, but similar) (http://jeelabs.org/2010/12/18/rethinking-the-arduino-hardware-interface/)

At this point in time, I'd be worrying about the choice of radio - Xbee seems is getting expensive compared to the low-cost BTLE and WiFi modules that have been coming out.

Thanks westfw.

Well at least I know its doable.

ChrisTenone:
You do realize that custom software is often expensive, right?

Paying for someones time is never cheap, but I guess it would be worth it in the end. How expensive, tens, hundreds, thousands?