I am avid user of Seat Guru and have been flying so much (carbon off-sets help me sleep at night) that I have almost memorized the seat maps for my carrier. However I do end up in hotels fairly often and Tripkick is going to be a rather fun site for me over the next few years. Tripkick encourages travelers to rate individual hotel rooms, in the spirit of crowsourcing information.
I think that there will be a further sociological tapping of peer-review and crowd suggestions in everything from restaurants to contractors. Already Angie's list has been a reasonable popular community based recommendation portal, and of course Last.FM is a music suggestion site. I believe that categories (food, hotels, car rentals, attractions) will continue to see specific sites dedicated so a narrow focus as opposed to general spaces like Angie's List. The driver in this trend is partly due to competition, but also the desire to have narrowly focused deep searches as opposed to wide and shallow information.