dug 
Those nice folk at TMW have started to blog. It’s a brave step for a traditional agency and one I hope that will energise their collaborative media activities. Getting into the spirit of the thing, they have started debating in public and are asking questions about some of the thornier issues of the day
Disclosure: I helped set up the blog and occasionally post to it.
Also, while I’m doing the link love thing, (on the topic of social and collaborative media) you could do worse than visit The Lecture List you’ll be surprised to hear it’s a list of lectures:-)
Anyone can post their events to the site regardless of size or funding. The service is free and entirely self-service. It’s a completely open system but the content is moderated so please keep the evil horrid stuff to a minimum.