Looks like soon Google Voice will let you port your own phone number over to their service for $20.
Previously you had to get a new phone number if you wanted to use the low-priced PC-based calling service. The service was rolled out to a few test users before word leaked and the info page was taken down, but Google told Engadget they “plan to offer this feature to all users in the near future.” Just keep those peepers poised on your settings page for the option to reappear.
For people who want to ditch their cellphone plan and go all Google Voice, this move takes down one more barrier. (You’ll still have to deal with any applicable early termination fees, though.)