I am over here right now. Been mentioned, I will say it again - Ryanair is a great way to book dirt cheap tickets -
http://www.ryanair.com/site/EN/
Then there is hostel world... I don't know what kind of accommodations you are looking for. It is easy for me since I am with a large group of people. Another goodie for finding a cheap way to travel.
http://www.hostelworld.com/