[fdbryant3]

To be honest I'm not sure. You would think that once they get it solidly on Android that they would seek to put it on other platforms. However they might be a little annoyed with Apple over Google Voice so they might not be rushing to port there.

In my opinion they have only made halfhearted attempts at supporting the Windows Mobile market. Granted Google Maps is a pretty solid apps but everything else really comes across as "well we have to do something, so here are some mobile optimized links".

It might be a while before we see it ported elsewhere (especially WinMo) particularly if they want to use it as the killer app to sell Android phones.

All in all I hope others step up and can compete with Google in this space. Right now I think MS is the only one who can do it though. If they are going to I think they need to do before Google ports to other platforms.