I'm big on visual thinking. Here are some of the people that inspire me:
Ryan Coleman http://ryancoleman.ca/
Dan Roam http://www.thebackofthenapkin.com
Sunni Brown http://sunnibrown.com/
Mike Rohde http://www.rohdesign.com/
David Gray http://www.xplane.com/
And if you're still hungry for more visit the VizThink Blog.
Enjoy.