I'm thinking about doing the walk between Prague and Vienna sometime this summer (2009). My understanding is that it takes 3-4 weeks and can be done with a mix of stays in local villages and campsites; I'm traveling on a budget so think the latter may play a role in the trip (at least on non-rainy day). More information about the walk is available at http://www.pragueviennagreenways.org/gw.html If you've done this walk before and have any good information/suggestions, I'd appreciate hearing from you! Also, if anyone is interested in joining me, please let me know what your summer schedule looks like - right now, mine is still pretty flexible. Thanks!