As a Mother’s Day promotion, Lufthansa is offering up to 40% off selected destinations. I tried out a sample itinerary (MUC-BOS, 24 Nov-28 Nov) and it returned a great schedule and price, under 650€ for both of us, R/T.
You must book today by 4pm, depart between 15.10.2010 and 15.12.2010, return between 17.10.2010 and 15.03.2011 (!) and stay for a minimum of 6 days (as opposed to the more common 2). The default departure city is Frankfurt, but I changed it to Munich for my search and the base price came back lower than advertised.