Just to add my data point. I've been using open-source Heyu (http://www.heyu.org/) with a head-less Linux server, the X-10(tm) CM11a computer module and good quality Leviton "Smart Home" brand light switches for nearly 10 years with very good success. Yeah, it's home automation-light (pun intended) but it works. Don't bother with the X-10 brand light switches. They are inexpensive, but don't have local dimming capability, feel/look cheap and usually die after 12-18 months. You can hack the internal X-10 module replacing the triac to fix/help the dying problem and also remove an R-C circuit to add local dimming ability (YMMV), but that's a lot of work and still feels X-10 cheap. Stick with the Levitons.

Batman nearly lost me on that little stunt. What a complete violation of our trust and the constitution!