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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.

Dawn Gray writes Busy Marketing Tips! Subscribe today by emailing subscribe@busymarketing.com and get free Search Engine Tips. Busy Marketing dawn@busymarketing.com