I don't travel near as much as I used to, but often still follow the blogs/boards and news about air travel.
Here are some of my favorite links:
http://flightaware.com (track your flight)
www.flyertalk.com (kinda like cruise critic for air travel)
www.flyerwiki.net (wikipedia for flyers)
www.freakjet.com (when I'm really bored)
www.seatguru.com (which seat is best)
www.expertflyer.com (see how what seats are booked vs blocked)