Blogging is great SEO - especially if you are any good at what you do! Who knows, if the blogs are good enough- they will come! Its makes your site more dynamic - which is good!
Go the whole hog and set up a Facebook page and Twitter account for the biz and when you add a new blog, put a link in FB and Twitter. Google loves these little link circles.
Make it part of your business process, one blog a month (easier said than done).
Finally put your blog in a sub folder i.e. www.yoursite.com/blog - this is good SEO.
Good luck.