Please post any information about GeoServer working with mobile client. The one link that a couple of people have pointed out is: http://www.skylab-mobilesystems.com/en/products/spot_bb.html and http://www.skylab-mobilesystems.com/en/products/spot.php Does anyone actually have experience with this?

Brent also found: http://eclipseme.org/ a toolkit that could be useful.