Twitter Platform for Lawyers?

In conjunction with Twitter's formatting changes today, TechCrunch had some interesting posts about specialized microblogging services.  The first was about Gospelr, which is a microblogging tool for Christians.  Gospelr apparently aims to be more than the Christian equivalent of Twitter; it would like to be a vehicle for sharing religious ideas and views both with Christians and non-Christians.  Thus, TechCrunch reports that Gospelr includes tweets of different colors, depending upon their source, and that the service allows users to share and upload files (as with Pownce).  Gospelr also has the advantage of auto-refreshing.  TechCrunch also reported today on Yammer, which is a microblogging system for businesses and is akin to Twitter.  After a company has used Yammer for free, the company apparently has the option of taking over control of the account.

What is the relevance of such services as Gospelr and Yammer in the marketing for attorneys and internet marketing for attorneys field?  It is clear that microblogging services like Twitter are becoming more and more significant both within businesses and within the legal community.  Law firms should encourage lawyer participation in such services.  A law firm could even use Yammer and take administrative control over the account.  Likewise, a law firm or group of attorneys could create its own microblogging service geared toward the legal profession or toward a segment of the legal profession.  Such a service could become a powerful tool in internet marketing for lawyers and marketing for law firms.

Is anyone aware of a lawyer-focused microblogging or Twitter-like system?