2. CGI. I really like Birdcast at http://www.bignosebird.com - it's what I use on my website. You can find more options on my Webmaster Resources page.

3. A service. Many remotely-hosted scripts are available. The most popular is Recommend-It at http://www.recommendit.com (which offers a contest as an incentive and allows you to add recommendation links to email you send out). There is also a free program called Let 'Em Know at http://www.letemknow.com which allows you to run your own contest for participants and probably offers more statistics. Either can be set up in 5 minutes or less.

Javascript and CGI scripts have benefit of being completely under your control. You can customize them to work on your website and decide if and how visitors are notified about origin of your script.

Services are easier to set up, but have to make a living somehow and may use advertising or big, tacky buttons with their name and/or logo in order to do so.

Don't delay! Set up a Tell-A-Friend system on your website to watch number and quality of your visitors improve without raising a finger.

5) Keep your site updated. That involves making sure all links work, and changing things around every so often to keep your look updated and fresh.

There you go, five ways to improve your website. Excuse me, I have to go follow my own advice!