I am already using twitter.com in communicating with the Boys Soccer program here at MHS. The intended use is for both players and parents to get up to date information within the soccer team. It has especially become beneficial in regards to game changes, practice reminders and changes, so whatever else needs to be communicated. We have dealt with two game changes this season due to weather, and instead of trying to communicate through a phone tree, email and text, followers are just simply tweeted the changes. Very simple.
Also tried out Wallwisher. Thought it has some cool possibilites. Could be used as a reminder board for soccer program, but see much more potential in creating a discussion board of sorts for academic classes. can see different post laid out. Similar to a comments section on a blog, but the layout has some potential to become something different.