Hello to anybody using the store-locator plugin! I have written up a tutorial that outlines the nitty-gritty steps required to add custom form fields to the store-locator plugin over at the Blue Print Design Studio blog: http://blueprintds.com/2009/06/13/tutorial-how-to-add-forms-to-store-locator-plugin-in-wordpress/
I know I saw a few posts asking how to do this so I hope this helps at least some of you using this plugin!