Nokia VP, David Rivas, was in San Francisco yesterday touting Symbian^3 improvements. While we've heard and seen plenty about Symbian Three's enhanced user experience already, it's still worthy of another look considering Symbian's dominant marketshare. Besides, David provides a very detailed look as he walks us though elements like the customizable (and more finger friendly) homescreens meant to provide quick access to call features and at-a-glance data. Rivas also reiterates speed improvement claims over existing S60 5