Great news: Messy Church now has a website.
Messy Church is what it says on the tin: a form of all-age church which involves plenty of mess, but which is ideally suited for running midweek, Saturday afternoons, after school etc. The 'normal' format includes a craft/activity/play time where parents and carers get stuck in playing with their kids, then a short time of worship, then a meal together. Several churches are picking this up as a monthly outreach, and it's been quite effective in reaching people who normally don't go to Sunday worship. "I don't see it as a stepping stone into Sunday services... it needs to be valid in its own right."
The website has ideas for services, lists of who's trying 'Messy Church', training events, and is a networking site for people who are trying it. One of the holy grails of Fresh Expressions of church is a way of 'doing church' which can be replicated in various settings without masses of effort. It's very hard going completely back to the drawing board with every new form of Christian community, mission or worship.
There's also a book (pictured), details via the website, or via Barnabas in Churches.