2.5m from the UK alone according to this: http://www.lattitude.org.uk/2012/04/the-number-of-gap-year-s... (sounds too high), this says 200k from UK http://www.gapadvice.org/index.php/considering-a-gap-year/fa... My guess is the worldwide figure is in the millions.

I want a rough plan with bus/train times, hostels shortlisted and other notes about how to make it all work together, then I'll probably change the plan if I stay in a place longer or shorter than expected. I'd like to have record of how much I've spend and will spend too. A lot of people in Europe are interailing, which mean they mostly just book trains and hostels - which seems like a simple use case compared to elsewhere.

Existing solutions in general are basically:

  - plan everything before hand e.g. get a bunch of receipts from STA travel before you go.
  - book a tour (e.g. g adventures), then everything is organised for you