DISCLAIMER: I've been fairly sparse with my involvement on this site, so this suggestion may not be as applicable to someone whose well versed in the communities doings and may be heavily self serving. I apologize if it reads in bad taste. Thanks for a wonderful site!
So, currently the site's purpose reads:
Answers.onstartups.com is a site for entrepreneurs starting and running new businesses.
Topics include financing, hiring employees, renting an office, legal, marketing, sales, compensation plans, banking, payroll, benefits, and more. This is the place to come with specific questions or to seek specific advice from your peers.
I realize the site is called OnStartups, but I've heard from a large number of individuals that the challenges that intrapeneurs face within Fortune 500 (and definitely Fortune 10 companies) are quite similar to entrepreneurs: financing, getting the right industry mentors, marketing new initiatives, proposal drafting and pitching - analogous to business case writing and pitching to VCs, and getting the right team together.
Of course intrapreneurship comes with its own caveats in each of these dimensions and also has some of its own challenges in being more tightly entrenched in local politics. Recently, as an intern at a Fortune 10 company, I've been proposing a new position for myself and have been learning of numerous new initiatives that are looking for support and growth within the company. So, this may detract from the initial intentions of the creators, which I would completely understand.
This site might gain a large segment of the population that may be deterred by a definition fit for a glorified group of individuals willing to risk any form of stability to be entrepreneurs when many are truly "starting and running new businesses" within larger organizations all over the world. Also, I think intrapreneurship is a great gateway for entrepreneurship for many and vice-versa, as can be seen in a post by someone, who felt unable to contribute as openly for the reason that they're not an entrepreneur in the traditional sense.
Whether or not the ideas bears any weight, thanks again for the great site, and I hope to continue being a part of the community!