I find using the Twitter web site frustrating at times because it doesn't offer up features that I've always felt could be easily added. So, I've gone ahead and built an app with the features that I've always wanted.
We know this only because one of Zachary's colleagues asked, rather indiscreetly, on Twitter: "How big of an audience do you think natalie portman lifecasting could attract?"
Tell a story about how you have used http://www.twitter.com to collaborate. Please indicate the context as well (I.e. in a K-12 classroom, in a virtual team, etc.)