Sure.... TOR is epage's implementation of a "google voice" client as a telepathy account that will "request" a call using the internet (data plan). The Google Voice I implemented works in a different way: it just emulates you calling your google voice number to place a call.... mainly it just "pushes" the keys for you. TOR can handle SMS while the "call out" version can't. I haven't tested but I would also assume that TOR is quicker to place a call. If you don't use Google Voice to send/receive SMS (or just have google forward them to your phone number) then the "google voice call out" option may save you battery (it does not need any process running in the background) and will not require any kind of data connection. The truth is that my implementation is a very low tech solution that was easy enough to implement and quite simple to use. TOR is a much more complex and robust solution... It is all about picking what works better for you... And just because options are great: you can also set MyContacts to use VICaR to place a google voice call. It will do exactly the same thing that MyContacts does (call and send the DTMF tones) but will allow some fine tuning on what tones get sent.
They're maemo and MeeGo... "Meamo!" sounds like what Zorro would say to catherine zeta jones... after she slaps him for looking at her dirtily...