Every now and then I look at meaningless numbers posted from Alexa.com about Travel companies and user growth etc.
But I always love the descriptions provided:
http://www.alexa.com/siteinfo/hipmunk.com
Statistics Summary for hipmunk.com
Hipmunk.com has a three-month global Alexa traffic rank of 15,128, and approximately 62% of visits to this site consist of only one pageview (i.e., are bounces). Visitors to the site view an average of 1.2 unique pages per day. The site is relatively popular among users in the cities of San Francisco (where it is ranked #1,325) and Seattle-Tacoma (#3,117). Compared with internet averages, Hipmunk.com appeals more to Caucasians; its audience also tends to consist of childless, highly educated men earning over $60,000 who browse from work.