I'm pretty unsympathetic to anonymous blogging, but there are cases where it's clearly necessary, such as for public employees. Presumably, the MPD suspect inside involvement:
The city of Memphis, along with Memphis Police Director Larry Godwin, have subpoenaed AOL to force it to hand over all records associated with an @aim.com e-mail address, including registration information, billing information, names, e-mails, faxes, phone numbers, or IP addresses...Emphasis added - and ain't that the point? This is why Spartacus actions are so important.
The user(s) of the e-mail address post to a blog called MPD Enforcer 2.0, which has historically been critical of the Memphis Police Department's activities. The blog has been somewhat of a sore spot for the MPD, especially as it has gained popularity online (and boy, is it going to be popular now). Among other issues, the MPD Enforcer 2.0 has discussed sexual harassment within the police department, questionable ticketing practices, and officers allegedly violating citizens' (and prisoners') rights. Godwin is often discussed extensively in many of the posts due to his position as director of the department.