In all seriousness, this is a perfect example of why (most) source code should be open-source. Closed-source software depends on "you can't see inside this black box"/"security by obscurity" measures that are vulnerable because they cannot be made more secure by the community.
The ISPs rightly refuse... if this is what they're blocking this week, what will it be next and where will they be taking orders from?
One (or more) of the 'agencies' of the U.S.A.? Interpol? Local law enforcement? The PTA?
The real issue here is that the "authoritative" (emphasis on the quotation marks) status of Wikipedia as THE place to go for information in the sense that it will in time be generally accurate. If Britannica is successful, Wikipedia's status will be diluted. Case in point: probably 90% or more of Slashdot users use Google for general web searches, while going to Wikipedia for encyclopaedia research, IMDB for movie research, Sourceforge for open source product research, etc.... We know better than to put up with a MSN or Yahoo query (unless the Google search came up unsatisfactory). If the Wikipedia results are unsatisfactory, we research and add to the article, making it more complete and authoritative. Are we going to feel compelled to verify that Britannica is correct as well? (keep in mind that Britannica would never have allowed free access, let alone editable content if it weren't for the success of Wikipedia). Do we really care that MSN and Yahoo perform poorly for most queries other than perhaps looking up the latest Katy Perry video or editorial content? This, of course, comes with a massive theoretical cost to freedom by concentrating the power with a small number of authorities (Google and Wikipedia, for example) but with the benefit of optimizing accuracy and reducing time required to "authoritate" the web.
Are you having fun yet?