I was directed here by Joel Spolsky's blog, and he was right. It is great. It is now how I print out, track, organize, and share with my wife my itinerary's. It is, possibly, the only way she knows where I am.
Yes, I am totally digital and have a blackberry - but while driving down the freeway or in a foreign country, it is just easier to have worked it all out ahead of time when you weren't sleep messed up and stressed out and hungry.
Heavily recommended to any who travel quite a bit.
You couple that with Skype, and the fact that I carry a small webcam, and it is almost like being a little bit home. I do manage to see my daughter for bedtime almost every night. The fact that she enjoys turning on the special effects and making me in to a sheep/vampire/snowstorm/etc... is secondary...