No, I'm not a shill for these guys. They just keep sending me emails because we flew with them earlier this year. Anyhow, here's their latest deal.
Book by Dec.31, fly Jan 2 through March 24.
I don't know if it's all flights or just selected ones, but for intra-Europe travel their prices seem to be pretty good, and the no taxes/fees thing ("what you see is what you pay") makes it a fairly good deal.
Check it out.