Marc and Karin have an excellent Round-The-World Travel Guide . It contains a great deal of information about how to plan, what issues to consider, etc. It's geared towards the RTW traveler, but the information in there is appropriate for any extended travel or even more limited travel. For example, all travelers face the issue of how to deal with money. Check it out, it's pretty good.
John Gregory has a site How to See the World: The Art of Backpacking with lots of good information about traveling.
I was with Nicolas when I was on Stewart Island. He also has a travelogue of his trip. There is even a small picture of Rob, Valerie, and I in there. He has several travelogues in there, but only the NZ story is in English.. He also has a photography web site called Wild Lights.