TripIt is a very slick web tool, for planning trips.  It's pretty simple, but works great.  Register, and give it any email addresses you might use.  Then, as you plan your trip and get plane, hotel and car confirmation emails, simply forward them to plans@tripit.com.  It parses the data, and makes a master iternary.   I've been testing it for a bit now, and am using it for a rather complicated trip to Europe, and it works great.  You can also publish your trip details, and share the link with others.  You can also add information manually, usefull for adding meetings or plans.  

On the road, you can access your info via email, mobile web browsers, or text messages.  Handy.

TripIt has some premium features that look attractive too, I ahven't tried them yet but if I continue to travle frequently, it might be worth the membership.  There are also some social networkign features, but I don't se the point.  If you travel much, or even just have one big trip planned, it's worth checking out.