i have an account with Gizmo5 and logging in today i read that Google bought them out, ... they've close new registrations, and they're in the process of clubbing things with Google Voice! it went for $30 mil! M.
its published in google blog on November 12, 2009 http://googlevoiceblog.blogspot.com/2009/11/google-welcomes-gizmo5.html
its a VoIP service, and a really good one,... the technology they have of hooking upto PSTN networks (normal land-line phones) is perhaps what made google interested in them! will be a good addition to Google voice, @chandan - i may be out of date,... been sick! M.