I love flyertalk! It's a community where you talk about... TRAVEL!:)
It is a forum filled with information on flights, hotels, car rentals, things to do, pictures... and so much more.
It's free to register and addictive too! I guess you just have to go there to see for yourself!
Thanks to Flyertalk and it's forum of helpful travel enthusiasts, I was able to book 3 business class tickets to Ireland in July for less than $800 each through mileage runs, great deals and applying to a credit card (which I needed any way).
It doesn't really get much better than that.