It doesn't really match the traditional integration paths that they're going to have to deal with across direct.gov.uk and I'm genuinely not sure it'll scale up that high if they are pushing people down that route.
We all know what happens once a year when we have to do our tax returns and that's all on a huge Java EE cluster apparently.
As regards scaling, it's a valid concern but one I suspect they'll have considered. A good number of brilliant people work there (I've visited and know the crowd).
They're building a new, single Government website, currently in beta at http://www.gov.uk, to replace the current http://direct.gov.uk and other government websites.
Also, it's been featured here before, but it's worth adding that I love how visible they've made their design principles[2].
[0]: https://www.gov.uk/vat-rates
[1]: http://www.direct.gov.uk/en/MoneyTaxAndBenefits/Taxes/Beginn...
(It doesn't say anywhere that it is, by the way, although there is a BSD-style license).
Pwrhaps ironically, the existing direct gov page has information on permitted uses of crown copyright materials.
* White House: https://github.com/WhiteHouse
* Other Federal Agencies: http://gsa.github.com/federal-open-source-repos/
Some state and local ones are listed at:
Government has been described as the engine of a lawn mower and the brakes of a Rolls-Royce - so it's good to see the brakes off for a while.
I do worry about those brakes though. In the design principles they disparagingly refer to an article on beekeeping as not a core focus for government (you did not know Ron Paul was a RoR guy did you?).
But beekeeping is on the live site because it represents a constituency of the live governemnt. Although they are under the cabinet office and so theoretically able to say no, I think hoping you can slim down government through web design is a bit - optimistic.
Dirctgov started off as optimistic as these guys - and what is not on github is the decision making process - when their mailing list is world readable as well as their code then we shall have open government
till then, the beekeeping lobby will have it's way - eventually.