My wife and I decided to finally drop our home phone line and upgrade our cell phones to iPhones (the increase in our cell phone cost is offset by canceling our home phone line). After we did this, I realized "what if my stepson needs to make a call and we're not home?" He's 7 so a cell phone is out of the question. After some searching, I came across the Obi100
Obihai - Home. Using this, we set up a Google Voice #, and with some simple configuration we now have phone service via Google Voice on our "home phone". At some point I'm going to set up the SP2 port for Callcentric so I can have 911 service. In the short time I've had the Obi100, this has to be the coolest thing I've played with, well since I got my iPhone a few weeks ago!