Editor's Note: Mark's 80-day journey may be coming to an end, but the blog must go on. In the days following Mark's return home, he'll be blogging about his gear, answering readers' questions, and readjusting to normal life (or not, as the case may be). And for those of you who've become addicted to his travel writing, fear not, because Mark will be setting off once again (as soon as his wife lets him, that is--he owes her roughly 482 diaper changes). In PROJECT GUINEA PIG, Mark (and the occasional guest writer) will be put to various travel tests--and will write about it every step of the way. He'll be looking for your help in planning these trips, and he'll appreciate your company when he's on the road.