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A potential customer stays across an average of 3.2 sites per task. Give them as many ways to stay up to date with your goods and services as possible. The other 2.2 sites probably are!
The same way you can automagically have fresh news and information pulled to your website, potential customers can add your "RSS Feed" to their favourite news reader.
With the use of user sign up forms, RSS Feeds and promo emails can be automatically talor made for individual users. So can the content on your website. This is also a good way to encourage website interaction.
See our own sign up system in action ... and please, SIGN UP! :-)