David M Johnson has some interesting thoughts on blogging tools as commodities:
Anyway, this made me start thinking about weblogging software as a commodity. If it is a commodity that means you can’t really make money selling weblogging software. You might be able to make money selling weblogging related services as weblogger.com does, or you might be able to make your existing software more valuable by adding weblogging features to it. Seems to me that weblogging features would make sense in an HTML editor/publisher, portal software, or even an e-Commerce suite. I wonder what other categories of software would benefit from weblogging features.