Okay, something need to be defined here: FS1, Silent Threat and FS2 are canon. Period. No "there's also...", no "such-and-such is unoficially canon...", zilch. End of list. (Yes, I know all that's been said before...)

Now, a good portion of the FS1/2 community that produces user-made missions and campaigns tend to base their stories on Warzone/Derelict/Twilight/tBE (coming "soon")/BWO (also coming "soon"). While this adds absolutely
nothing to the canon "factor" of those campaigns, they do have logical continuations of the FS2 story and many side stories that can be developed and fleshed out. But they are still neither canon
nor official! Even if they hit upon the "trillion-monkeys-typing-on-a-trillion-typewriters-for-a-trillion-years" combination and ended up being
exactly what

would have come up with, byte for byte, they would not be canon unless

said so.
Think of it this way: you write a fiction book. The book leaves the reader at a virtual cliffhanger, but you decide not to write a sequel. Then, a few years later, your biggest fan writes a continuation to your book on his own. It fits with what is put down as fact in your book, and it seems like a perfectly logical continuation to your book - it may even be exactly how you were thinking of continuing it. But it ain't canon simply because you, as the originator of the idea, did not write it nor endorse it.
Anyways, all that is probably completely unneeded, but my fingers just wouldn't stop...

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"He who laughs last thinks slowest."
"Just becase you're paranoid doesn't mean they're not out to get you."
"To err is human; to really screw up you need a computer."
Creator of the
Sandvich Bar, the CapShip Turret Upgrade, the Complete FS2 Ship List and the System Backgrounds List (all available from the site)