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Is my favourite. But I don't agree with a service company providing an infinite symbol as their primary logo. The idea of, "infinite" as a general concept is very vague when used in general context ("To infinite and BEYOND!"). Thus contributing to your over-all design seemingly be represented as vague.
I didn't see any reference as to whether these services being provided were free or not. An open community type of system might be an awesome idea. But otherwise, it's all been done before.
Either way - Good luck!
Just spit-balling here. But you could change the feel of the site dependant on what activity the user is browsing... Orange = Designers, Blue = Writers, etc.
