Hi Sylvia,
This is a very interesting topic - how do practitioners find appropriate networks? There are now lots of different communities and groups for teachers developing e-learning and these are scattered around the internet - perhaps what is needed is a 'meta community' that links them all up!
I have used a range of ways to promote the Best Practice Models community - presentations at conferences and local networks, postings to a variety of email lists with invitations to attend events and personal recommendations too! I also have groups on Facebook and Ning to signpost to the community.
Helen