Blogging - Keep them comfortable. Let your visitors know what you've been up to.
Simple Image Galleries - First impressions count. Show off pictures of your offices or staff.
Flash Headers - Guaranteed to draw attention. Pack more content into one space.
Streaming Video/Music - Hold people's attention. Instantly streaming video/music.
Forms - Increase response rates. It's easier than opening up an e-mail client.
FAQ Bank - Reduce calls and e-mails. Keep track of common questions and answers.
E-commerce - Increase sales. Sell your products online, or require deposits for services.
Live Help - Reduce uncertainty. Make sure they're 100% confident before buying.
Discussion Forums - Keeps visitors coming back. Let them interact with each other.