Thing to Do

So the fun part begins...planning. I leave for Italy in 2 weeks and I am super excited, it will be my first time there. When I come home, I want to really get to planning this backpacking trip for next summer. I really want to see as much of Europe as possible, as I am off to grad school in the fall of 2010. I graduate in December of this year, and my best friend graduates in May so we hittin the road!! If anyone has any suggestions as to where we should start, I'd appreciate any input. I really want to see Ireland, but I've heard it is cheaper to fly into London. Does anyone know how the travel works between Edinburgh and London?
than for last week to venice Itly.please advise.