If you look at the font of all wisdom - no, I don't mean Wikipedia, but Amazon - you will find stacks of books with titles like The Corporate Blogging Book, Blogging for Business, Blog Marketing and the rest.  Whatever the title, the basic message is the same: if you're in business, you've got to be blogging.  Because if you aren't, you're not "having the conversation" with your customers, which means, in turn, that you're not getting your message out or valuable comments back.

In many ways, an open source project is just like a business.