When I travel now I feed the confirmation emails to tripit. Tripit publishes them as an RSS feed, and Dopplr picks them up, as does Facebook. Originally I used Dopplr becuase it was used by a bunch of colleauges and people I knew. However, over time most of my friends have shown up on Facebook.
I got an email from Dopplr this morning with a link to my 2008 travel summary email and this rather splendid chart. The more times you travel to a place, the bigger the circle gets.
Which makes me think about feeding plans for 2009 travel. Hmm.