I love twitter but I am not sure if I would want to twitter directly from Windows Media Center but if you want to you can with TwitterMCE.
TwitterMCE will allow you to post tweets, view friends, followers and timelines within Media Center. This is just a beta program so there may be some bugs. This is a MCML program and you must have one of the following operating systems, Microsoft Windows Vista Premium, Microsoft Windows Vista Ultimate or Microsoft Windows 7 Media Center
I will download and give it a try later
More details and the download on MCEZone.com
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