I've been on a number of the one's already mentioned. Flyertalk is far and a way the best.
A few others I've visited on occasion (not yet mentioned) include:
http://www.travellerspoint.com
http://www.virtualtourist.com
http://www.attitudetravel.com
http://www.mlive.com
http://www.ityt.com
http://www.businesstravel.about.com
None are as busy or as good or as useful as FlyerTalk.
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Travel well and arrive home safely,
Jon David
www.simplyjond.com - Tales & Things for Frequent Travelers