The word from Phoronix is that Google has a few Linux applications up their sleeve, but there is no solid information on what they might be. Google Talk seems like a reasonable guess, or Google Desktop. Personally, I have never had a desire to run any Google app on any rig, except Google Earth of course.
The goal of the Google Linux Client Team is to develop Linux desktop applications, such as what we have seen from Google Earth and Google Picasa with official Linux versions. Also mentioned on this slide was significant accomplishments / releases this year: TBD.
Source: Phoronix