I purchased an OOMA (
http://www.ooma.com) hub last night
I spent 10-20 minutes to register a new number (could have transferred my current number for a small fee, but decided on a new number instead) and set-up the hardware thru my Clearwire internet receiver. Since it's possible to choose a number anywhere in the US, I could have easily chosen a primary number in Boston so that friends/family there could place a local call to me, and then have my secondary number local to here in Seattle for friends and family here
60 minutes of calls later, I'm well pleased with the sound quality even while simultaneously downloading significant data files or streaming videos from YouTube.
the hub runs roughly $200, and with the exception of a yearly $11.99 FCC tax there's nothing more to pay ever if you utilize their basic service. for an additional $11.99 monthly you can upgrade to their Premier service which includes the ability to have a second dedicated phone number
as an added benefit, it's even possible to listen to your voice mails via a secure log-in web browser
all the best,
R