If you aren't already a Dopplr user, I recommend getting set up with this social application for travel (see below). By logging your upcoming trips on Dopplr, you can see which of your friends or contacts may be in the same city, but also see their upcoming travel plans. Members of the top 100 non-profits, business schools or luxury brands have special invites. http://www.dopplr.com. It's a good way to see LIFTers also travelling.

Equally as interesting is an app developed a while back by nodesnoop called Offsetr, which analyzes the travel patterns for you and your friend network to calculate your future travel-related carbon footprint. Make of the data what you will, but it is an interesting exercise in transparency. http://www.nodesnoop.com/offsetr/

PS: Noneck, did you cover all that carbon with an offset? ;-)