What is the most useful travel site to you?
The two most useful for me are FlyerTalk(great for promo and point discussions across all brands) and Tripadvisor(reviews on hotels).
Another one not known as well is http://biddingfortravel.yuku.com/ which helps with Priceline bidding. Great for hotel bidding.
No further answers on websites, but your photo prompted me to add one of the moon I took on June 12 from the top side of the Louis Majesty after Santorini, using my always amazing Kodak Z980 zoom.