Trip Advisor's top travel trends has some interesting tidbits. I particularly liked that Americans chose other Americans as being both the most friendly and the most annoying of travelers. You can tell their main concern is leisure, not group, business by things like the top international destination being Budoni, Sardinia, and domestically having St. George, Utah, in the top spot for 2009.
But the trend toward greener travel and greener destinations I think goes across the board, as is the likelihood of someone pilfering towels from a hotel (20 percent) and the 51 percent who spent more on travel this year than they originally planned to.
Check the link for more on top airports, hotels, airlines, tipping trends, and more.