Taken from Creative Commons
Last week, British lawmakers passed a new bill to add electronic publications (including websites) as documents stored in national archives. This new law augments existing laws that cover all printed materials produced in the UK since 1911
Now thats excellent news, because it will not be optional and the grey area of archiving will change. Lets hope those overbloated CMS can handle archiving too. Theres seriously no better time to make the change to XML.