While there is a cottage industry in books and seminars on how best to design to your Web site, there's a government site that offers a lot of good advice for free: Webcontent.gov.
The home page contains the following sections:
- Requirements & Best Practices
- Usability & Design
- Improving Your Website
- Using Technology
- Managing Content
- Management & Governance
- Resources & Tools
- Getting Started
Besides these general subjects, it contains nuggets such as "Content Management Systems Used by Government Agencies" a tutorial on RSS. Check it out; I think you'll find it well worth your time.