One of my clients emailed me the other day about SEO in relation to her business blog... I will give her a more comprehensive answer by email, but this conversation over on Mike Sansone's ConverStations echoes a lot of my thoughts on the matter, as far as business blogging is concerned at least. I do think its useful to understand how to use keywords in your posts and be putting them in the title, body and keywords boxes, but I also agree that you can get too hung up on these things.
I was chatting to another business blogger the other day and they told me how many page views per day they were getting (it's about 3 times what I get), but they don't seem to be converting many of those viewers to clients.