Yapta's push into the corporate market is a no-brainer as it can provide a valuable service for large corporations which don't have such tools of their own.
Google's loss of Marissa Mayer, who choreographed the Zagat acquisition, to Yahoo won't slow big plans for the the Zagat integration into Google search.
Expedia can decide to pick its spots when it decides to play hardball over the hotel tax issue, but will it need to change its strategy as more cities follow in Arcadia's footsteps?
The Kaggle code-writing contests are interesting if the programming geeks don't get ripped off. But, Jetpac's photo-curation algorithm leaves a lot to be desired.
As airlines get better at passenger profiling they will drive greater loyalty among frequent flyers, but they should make sure the the gap between high-flyer and leisure traveler isn't so wide that potential customers get turned off.
The genie is out of the bottle -- smartphones track your every movement for law enforcement and travel apps' developers purposes. The backlash is coming.
TripAdvisor's path to global growth is a much easier one than Kayak's and it is not hard to envision heightened competition or even a merger of the two over time.
A Wikipedia-like wiki travel guide could be a tremendous, free resource for information-hungry travelers. The current efforts have been starved for resources.