Hey, cool! I've been tinkering together something custom using a VeraPlus [http://getvera.com/controllers/veraplus/] and a raspberry pi for the last couple of years. It stopped working a few months ago, and sadly I replaced my whole vera controller before realizing the problem was that the wall wart had degraded and was no longer supplying enough voltage. D'oh!

The Vera doesn't have wifi (well, it does, but it can't join a network!!!), but a regular old raspi can act like a wireless bridge, offering wireless access to the vera, and a sound card, and also a linux environment to run my custom rails frontend. Add in some location reporting via Tasker, and I have an announcement sound whenever an outside door is opened, and I have motion and light sensors that record video and upload it to my personal website, and it's all controlled intelligently based on when my wife or I are at home. I'm pretty proud of it.