The bitcoin project is de-facto the official standard bearer for the development of the bitcoin network. The Bitcoin Foundation is just formalizing it.
And is such formalization necessary? The potential for misunderstandings is big there.
If this was named "Gavin's Bitcoin Development Group" I'd probably be perfectly fine with it. "Bitcoin Foundation" is a lie in its own name, and will certainly provoke misunderstandings.
I would prefer if Bitcoin stayed just like E-mail: no "E-mail Foundation", no "E-mail phone number" etc, and everybody understands that very well. Nobody asks for an "authority over E-mail".
HTML5 is determined by a standard group. There's no evil people going around making HTML5 into a tool for government spying.
HTML5 doesn't have enemies. And HTML5 is not really significant to me, so I just don't care. About Bitcoin I do care though.