My SunRocket package turned up today - and so far I'm impressed.  My $199 got me one year of service, a VOIP adapter and 2 x cordless Uniden phones.  The adapter (SunRocket call it a gizmo) plugs directly between the cable modem and router - although I put mine behind the router as I didn't have the right cross-over cables.  I plugged in the device, waited for the adapter to connect and I had a dial tone!  Easy!  I tried a quick call to my cell phone, which worked.

One small thing I couldn't work out however is how to change the IP address of the Gizmo.  The instructions claim you can browse to the default IP address (192.168.251.1) to get to an admin web page, but I couldn't get it to work.  No big deal - I just changed the address of my router and wireless printers to a 192.168.251.x network...