I will add that I was offered a choice of the following:
$350 E-Certificate: For travel within the 50 United States, Puerto Rico, or U.S. Virgin Islands during the travel period specified. Save off published United fares on a qualifying flight purchased at united.com. Ticketing and travel by November 27, 2010.
20% Economy E-Certificate: For travel to worldwide destinations from the 50 United States, Puerto Rico, U.S. Virgin Islands, Australia, Canada, China, France, Germany, Hong Kong, Japan, Mexico, Netherlands, Singapore or United Kingdom during the travel period specified. Save off published United Economy fares on a qualifying flight purchased at united.com. Ticketing and travel by November 27, 2010.
15000 bonus Mileage Plus miles: Members can redeem miles toward award travel. Mileage Plus offers our members the most extensive selection of award travel destinations including over 800 cities in more than 139 countries.