Have someone read your sites content and take out all jargon.
Include a toll-free number and email contact on every page.
Include a complete description of your services or products, include a price list if appropriate.
Include testimonials in your site.
Include a site map.
Offer links to additional resources your visitors may be interested in.
Content should be short and to the point, use bullets when appropriate.
Include a FAQ section.
Include an ongoing, updated blog.
Offer a newsletter, update it regularly with useful information.
Make it easy for visitors to bookmark, tag, or subscribe to your RSS feed.
Send email to your contact list inviting them to read more about a new service, a new product, free information, or a contest for return visitors to your site.