Why use web standards?
I wrote this post a while back. The content can still be relevant but the information I've linked to may not be available.
Roger Johansson at 456 Berea Street has published Ten reasons to learn and use web standards.
There are some good points here but, in our experience, most small business owners with websites will probably only care (rightly or wrongly) about these two:
#6. Improve search engine rankings
#3. Maximise the number of potential visitors
Hey – that's good enough isn't it!