Give the client a reason to come to your site
Give the client information that they can use
Easy Navigation
Make it easy for the client to get around the website 
Be well organized
A well organized site makes it easier to find the items or services that you want
Keep it simple
Keep the site simple and consistant
Use meta tags
Make your site easy to find for the search engines
Ask people for feed back
Find out what people like and don't like
Update your site
Refresh your content to renew peoples interest
Write an interesting blog
People will read it 
Don't build an entry page 
This will decrease your google ranking
Don't build a flash intro
People hate them! Build you flash in a flash section