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Like you said, you have 60-70 characters to work with on the mobile side so I would say short, to the point, non superlative marketing messages should be used in your title and description meta tags.
On page content optimization and relevant incoming links should be the same...
Keyphrase research tools you can use are wordtracker, server log files and analytics (google analytics is good), the overture inventory tool is gone now...
do a search on WebmasterWorld for key phrase research tools...
mike.
I misunderstood you... I tried a google search at google.com from my mobile device. I have not tried a search at G mobile. Will do that and let you know.
Yes the same keyword research tools will suffice as keyphrase research is independent of desinging a site (screen size, fluidity, etc) for mobile applications.