Anyone have some good budget tips when travelling around Europe? ANYTHING at all?

Planning a trip around the whole of Europe, for about 6 weeks. Planning on getting a train pass to travel around. Just wanting to know if people have gone to Europe how much (or how little) did you spend, and how'd you do it? did you compromise much?
P.S. travelling for two people

See some of the tips at :

http://www.jetsetgotravels.com/forum/viewtopic.php?f=10&t=9
&
http://www.jetsetgotravels.com/forum/viewtopic.php?f=10&t=3

Search here for cheap hotels

http://www.jetsetgotravels.com

It provides search option like near a landmark etc

But beware ... cheap hotels can be trouble some times so check reviews of the hotel you are going to book.

Check the exact location of hotel from google maps.