Inter-Rail pass is the thing you're looking for, although if it isn't completely unlimited travel then sometimes it's better (cheaper and quicker) to fly (e.g. Paris to Spain/Portugal would take quite a long time on the train).
inter-rail, eh? i will look into that. the only place i've looked so far is eurorail.
i think we're likely flying into london, doing the chunnel to paris, statying in versaille for a night or two, staying in munich for a night on the way to the dam and then back through to the same places before ending up in london again for a few nights before i fly to ireland.
and rast, i won't be staying in hostels. i'm staying in a couple real swanky hotels. i have a lame job, but it does have it's perks since i can get a company rate at some of our 5stars in europe
There are some real cheap flights around Europe, although they tend to fly to secondary airports, which can be a little out of the way. Sometimes they're like a couple of euros and the most expensive thing you gotta deal with is the airport tax (which is closer to 50).