Google Alerts now supports blog search content. If you subscribe to a Google News alert for your brand or topic of interest you can now receive the same style alerts for content in the Google Blog Search index.
Google Alerts tracks news, blogs, Usenet groups, and Google Groups discussions using the same search syntax found on their respective website. The new blog search e-mail notification will be an easy extension of vertical search for existing users. Advanced users can setup an advanced search, or choose to receive general updates via web feeds and critical updates via e-mail. I expect Google will add Google Talk integration soon, delivering alerts over IM.
Disclosure: I own a small piece of Technorati, a competitor to Google Blog Search.