Let's talk about content for a minute.
Do you know what I love when I visit a website? New content. Things I haven't read before. A reason to stop and digest instead of making a beeline for a specific page.
Nowhere is this more true than on a company's blog -- especially if I really enjoy the subject matter. A blog post goes up, my RSS reader lets me know, I click through, and boom! I'm right back on that company's website. And I'm in a position to buy from them. Over and over.
If you aren't constantly adding fresh content to your website, it's time to start. I'd love to help. :)