Nice idea but please use it properly... you have a team of people who work on C9 let them tweet their geeky thoughts through the C9 twitter channel. It's about conversation not one way communication.
Sending out url's when the site changes is all well and good but the site's not mobile enabled so the links in Twitter to mobile phones are basically useless until you are back at a machine. (after all that seems to be one of the primary use scenarios for
this comms channel.)
I'm glad to see you all using new media tech though! It's definitely a good start.