While TypeKey will be controversial, I think the need for such a service for corporate use of blogs should not be.  Corporate blogs are going to be fairly stringent against inappropriate comments and, without strong comment management capabilities, cost of maintaining corporate blogs will be too high.

A comment management feature I have yet to see anywhere is the ability to transfer comments from one blog to another.  Such feature can be used to move customer complaints lodged at a company's marketing blog to their customer complaint blog.

Speaking of corporate blogging, Corporate Blogger's Dinner will be held this Wednesday in San Francisco.  Be there.  BTW, anyone bringing up political issues will be beaten silly with teriyaki chicken.