Last year, Ian McCarthy and I puppeted over 50 characters from the Wandering Rocks chapter of James Joyce's Ulysses on the microblogging platform Twitter.
We're planning a reprise for this year, including much more notice than we gave in 2007 (Bloomsday is June 16).
You might want to consult the original announcement and abstract of the project. It includes links to all the characters' Twitter profiles in case you want to follow them. We've also created a Facebook Group for the project. We'll send out announcements and reminders from there. And here are links to some mentions of the project on the web last year: