The tags pertaining to lists and the tags pertaining to tables should be grouped together.

I think that, for the formatting tags, instead of writing out what they do, perhaps just a list demonstrating their correct usage and then the affected text would be useful.

The thing where many of your examples of the formatting tags in use don't actually display correctly is a known bug, an effect of the extremely aggressive reset.css, see http://bugs.dwscoalition.org/show_bug.cgi?id=816 and http://bugs.dwscoalition.org/show_bug.cgi?id=1151.