Bill Foust has been a recognized activist and consultant specializing in the Rim BlackBerry for more than five years. He's an active participant in BlackBerry developer forums and the BlackBerry-users Yahoo! group. He has written many BlackBerry applications including ExpenseMinder and EzToDo, which were two of the best-selling applications at Handango.com. He also had one of the first websites devoted to helping developers at www.rimdev.com.Foust, Bill is the author of 'Mobile Magazine Guide to BlackBerry ', published 2005 under ISBN 9780789733436 and ISBN 0789733439.