www.avsim.com This is as good as, if not better than Flightsim.com, and there is no need to register.
They also have an excellent forum section!!
P.S.
Unless your interest is helicopters, sell your FS2000 and buy Fly! instead....you won't regret it.
No..I don't work for them;-)
Rgds
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'I may disagree with what you have to say, but I will defend, to the death, your right to say it' - Voltaire