Europe bound this summer

hey all!
I am making my way on a backpacking trip this summer through Europe.
Approx. mid july-mid august where i hope to celebrate my 30th!

I was wondering if anyone of you lovely European Purple peeople are registered on www.couchsurfing.com or are familiar with the concept.

I will be staying in hostels but if i can meet friendly people and stay on a sofa or 2 along the way that would be very helpful.

orgnote me if you can with any details

my estimated itinerary:
paris, amsterdam (i know there are lots of you guys out there!) berlin, munich, venice, rome, florence, nice, barcelona, madrid, bordeaux and back to paris.

any help woul dbe greatly appreciated!

Thanks