I hesitate to suggest this, FalconFly, since I'm rather enjoying this exclusive online club amongst such exalted company ;) but-

Why don't you put a bigger, more obvious banner on your site pointing to this forum?  I don't think that many of your site's visitors notice that it's here.

Mind you, we'd probably then end up with all sorts of common riff-raff in here, so maybe not, eh? ;D

Hmm...

I see alot of Guests going through it often enough, but indeed only few seem to bother Posting, or even registering ?

My Idea was to leave it to everyone else to spread the word, if he/she likes this Forum.

Anyway, I'll come up with something that might highlight it a bit more ;)

--- edit ---

I've modified it somewhat, so it's a tad more eyecatching...
Hard to find good imagery though, hope it looks kind of okay ;)

--- edit 2 ---
Okidok, I gave it a little more finetuning...
I guess the way it is right now, is about as good as good can get ;)

Greetings
FalconFly