Interning at the Eureka Ranch this past summer (eurekaranch.com), one of the key things they taught us was that through quantity you can often find quality. By coming up with as many descriptions of your company in as many ways as you can, you'll eventually focus in on what really hits you as right, even if you write down 10000 wrong ones on the way there.

Personally, I particularly like the concept of Kaizen (continuous improvement) when reading this post- this seems like essentially what your company is allowing people to do for their knowledge/brain. You could go for the whole stay competitive/stay ahead of the competition/professional-personal development deal, but eh. When everyone says the same thing it sorta loses its appeal.

I'd been toying with a somewhat similar idea in the past and wish you the best of luck with it. Knowledge transfer should be one of the most important industries in the future. When I was looking into it I'd found some that offer a similar idea, but for professors to post research articles about the areas they're interested in. The name escapes me, but if you poke around and are able to find them that may give you some ideas as well.

These are all more tagline type things, but maybe they'll spark some ideas: 'User generated Kaizen for your brain' 'Community created continuous knowledge improvement' 'User generated continuous skill improvement' 'Professionally generated Kaizen for your brain' 'A professional community designed to allow you to continuously improve your (programming/designing?) knowledge /skills'