Just a minor note with the OpenGuides home page
it lacks the "background-color" attribute of the body element in its css
while the site seems to be designed to have a white background.
Without the background-color attribute in the css (or the "bgcolor"
attribute in the HTML, which is however deprecated) the user, when he
visits the site, sees the default background color he has set in his
browser, which could be different from "White" (mine is a shade of gray
for example), so that the result can be quite dusturbing.
If you have not experimented this, it's only because you browser's
default background color is set to "White" (which is the default choice
for many browsers, but the user can easily change it).
Thank you for your great work with OpenGuides!