Do you want to network with like minded Sustainability professionals?Simon Dyke has an online network on Twitter and wants to invite all sustainable building designers to join in the chat, banter, and discussion. You will need a Twitter account and then the follow the shortcut to join;

http://twitter.com/SustainableSi

Incidentally there are some great mobile apps to use - try the Blackberry app;

http://uk.blackberry.com/devices/features/social/twitter.jsp