I think some govt messages, eg healthcare, parenting, could come via MN, but it would also have to be done via Netmums/Bounty etc to achieve coverage; even then, not all parents go online. You could have a few govt messages at the end of our weekly MN emails (not Aitch's!). Eg:
We have tons of stockpiled swine flu vaccines, so pregnant women should definitely be vaxed asap
Your library has books on PND if you need them, but speak to your HV if you think you've got it
Feed your dc vegetables
etc
It would be great to see an end to spin from the Dept of Health, and spin doctors come very expensive, so potential savings would potentially be pretty vast across all govt depts.
I think local councillors should be responsible for disseminating local council info to residents, mostly via group emails. They should know their residents well enough to be able to disseminate info effectively to those who are not online. It would give them something to do apart from swanning around in Mayoral cars visiting Events and enjoying hospitality, as mentioned in an earlier post. It would hold them more accountable, too, because residents would be able to hit the reply button and say "I object." And it would mean people would actually get to know who their local representatives are.
Could MPs do similar with govt info? The Tory party were very adept at using emails during the run-up to the election, so they know how to do it.