BusinessWeek provided information on "jumbo" reverse mortgages and additional resources on reverse mortgages in their latest edition.

Most of the key decisions discussed apply to considering a jumbo as well as a smaller reverse mortgage
http://www.aarp.org/money/revmort/revmort_decisions/   Calculate the size of the jumbo reverse mortgage you could get from one lender.
http://www.financialfreedom.com/ReverseMortgageCalculator/   Search for “reverse mortgage” to get information on the Housing & Urban Development Dept.’s HECM reverse mortgage and to find HUD housing counselors who may be able to answer your questions.
www.hud.gov   The trade group representing reverse mortgage lenders offers a consumer guide, Just the FAQs: Answers to Common Questions about Reverse Mortgages
www.reversemortgage.org