Preface:
- I have tested as much as I could of this app and felt that all of the major functionality works except for the calling (obviously; as the calling function uses a cellphone signal which your iPod Touch does not have.
- You will need to have a jail-broken iPod Touch, so if you haven't done so yet, do so now. You can search for the means to accomplish this.
- You will also need the Cydia app: 'iFile' so search for it.
- Also, if you haven't done so yet, you need to download the 'Google Voice for iPhone' app to iTunes here.
- Once you have performed everything required stated above, head to iTunes » Apps » right-click on the Google Voice app » Show in Finder/Explorer.
- Copy that file somewhere.
- Change the file extension to .zip.
- Open/Extract that file with your preferred file decompression software.
- Navigate into /Payload and re-zip the 'GVDialer.app' file/folder up (In Windows it will appear as a folder, in Mac OS X it will appear as a single file) [redundant, I know, but it makes things a little simpler in the long run].
- Make sure your iPod Touch is connected to your computer in some way via WiFi.
- Now open the iFile application in your iPod Touch.
- On the bottom Panel, 2nd icon from the left there is a WiFi signal icon; press that.
- Locate the IP Address where it should say something like: Accepting connections at ……
- Enter that IP Address in your preferred Web browser like so: http://172.168.0.1:10000 (not the real address, use what you got in the previous step).
- Navigate into the /Applications folder in the Web Browser and upload the GVDialer.app that you zipped up previously.
- Unarchive it using the built in feature in iFile.
- Press the blue arrow next to the 'GVDialer.app' folder and apply these settings: Apply hierarchically » ON; Owner » root; Group » wheel; User » Read,Write,Execute; Group » Read,Execute; World » Read,Execute.
- Rebook/Respring and you should be done!
[crarko adds: I haven't tested this one. As you know I'm not a huge fan of jailbreaking but some folks may get use out of this.]