It looks like the deal works in the month of Nov-Dec-Jan-Feb
Example days Nov-10-2008 until Nov-19-2008
Fly From JFK to Munich. Price $378.99
If you make an account with them you could reserve the tickets for 1 day with out putting you credit card online
Cites in Europe that the deal should work are:
Brussels
Munich
Frankfurt
London
Rome
Venice
Amsterdam
Milan
Lan.com