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This is a fantastic design. it's very clean and easy to navigate. I had a few notes based on your screenshots - but they were no problem when I went to your site!
I would only think about three things (and it took me awhile to find them!)
1 - i found the little paragraph symbols that showed up when I hovered over headings in the documents page to be confusing. I clicked on them and honestly still don't know what they did - besides jump me down a little. I would consider taking those out or writing where they move you when you roll over.
2- for you promote mediacore button - I love it! However, I think you should put just a little tag line of sorts so somebody had some kind of idea what it is when they see it on someones website.
3 - In your demo page - that big black area that houses the videos. i would make the "header" and "footer" of that less tall. Make those buttons smaller as well. they just take up too much real estate on a page that should be focused on the videos.
Great job! I really like it!

Ah those paragraph symbols... yes they are a little odd aren't they. I think it's a "feature" of the sphinx documentation platform we're using... I'll have to see if I can strip it out.
Great idea on creating a tagline for the promote mediacore image.
Roger on the real-estate taken up by the header and footer. I've been wanting to go back through the front-end and redesign it a little, but for the initial release we just clean ran out of time and budget.