When we work with someone who wants to blog, and they don't want to use Joomla content items (like we're using here), we generally recommend blogger.com. This is a free service from Google. It's a bit limited, but it's drop-dead simple. We can then do an RSS feed from the blog to the main website. There's another blogging service that's about to get my nod. It's called Tumblr. I think it may be even simpler than blogger.