Wind Energy Development Act of 2007 or the WEnD Act - Amends the Internal Revenue Code to: (1) extend through 2012 the tax credit for production of electricity from certain renewable resources; (2) modify the inflation adjustment applicable to such credit; (3) extend through 2012 the tax credit for holders of clean renewable energy bonds and increase the limitation on the amount of such bonds authorized for issuance; and (4) set forth allocations of bond amounts for certain projects.