Facebook for birders

I discovered Birdpost whilst I was doing my bit for the Orwell Diaries blog and voting in the Webbys. It is a very slick, cleverly thought out site for 'birders' with all the web 2.0 features you might expect - user generated content, tagging, twitter and blog presence and even an iphone app. According to this info it will give 18 million US birders a way to chronicle, organize, map, and share their collective birding activities online.

It has nothing to do with archives except that I could see a similar resource working very well for certain user groups with an archival slant - perhaps railway enthusiasts or military researchers?? What would need to happen to get these archives enthusiasts to build a resource like this?

Anyhoo, it impressed me and I thought I'd share.