For all of the Shop.org member companies that have multiple employees tweeting, Bazaarvoice has developed TwitterVoice, an open-source application for your website.  You can read more about it at Bazaarblog, or click on the screen-shot below to see it live and download the sourcecode.  This is perfect for analyst or consulting firms (and even the Shop.org team), as well as the many progressing retail members and vendors that agree that the collective voice of their employees is one of the major representations of their brand (perhaps secondary to their collective customers’ voice).

Example of TwitterVoice, as deployed by Bazaarvoice