Twitter is practically old news now. I am fairly new to it and am looking for people interested in educational technology and/or distance running. You can follow me @ markgarrison, or find others to follow by using Twitter search.
Mobile is really the best way to stay on top of this.
I think the real news about Twitter is all of the knockoffs that are using this technology. There are over 200 Twitter-esque services out there. One that could transform the collaborative nature of work is Yammer. You can use it for free to follow others in your office. If your business would like to manage it in house they can pay a fee to have more control over the service.
There is even a Twitter takeoff for the classroom. Let me know if you are using Edmodo. I am curious to hear how it is going.