mmmm with so many different creative mediums, you're effectively creating a site that can work as both a portfolio and a networking tool yes?
I'd be careful with shapes and idents in this case, a reel of film and you're going too film-maker, a paintbrush more art, a photo more photography and sooo on.
With it being what it is, think along the lines of interchange or community (as you've said) - look at sites like theserif (theserif.net) and it's nice that (itsnicethat.com) - both are effectively design blogs showcasing nice stuff, both have clean logos with any bias on creative field. The serif actually has a forum behind it too, though you can get to bogged down in detail...
Of course the key one is behance...
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