My colleague Peter just sent me some links to some great stories about the business benefits of blogging. This after I just yesterday gave a presentation about online marketing, highlighting the value of blogs for business.
You don't need a new website. You need to make your current website more effective!
How can you do that? There is no single answer -- websites are part of a larger system, and you need to consider many different aspects to make your site effective.
We've been making websites since the start of the web, and know what makes them work -- as well as not work. Take what we have learned to make your site better!