In “Holy SHIFT! PRWeb Plays Tag with Social Media” PRWeb report that they’re incorporating Technorati tags into their press releases:
This enhancement to PRWeb’s services builds on the companyâ€™s existing social media press release distribution platform.
In addition to facilitating the development of a tag space unique to the public relations community, PRWeb is making it easier for users to generate tags for Technorati. Users will find this extended feature on the Advanced Options tab within their news management console.