LinkedIn have now have a new blog about their excellent service which might be an interesting read. You can find it here:

LinkedIn Blog

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Updated 2021 : note that the above post is out of date as it was originally published in 2007, but is left here for archival purposes. I no longer agree with my previous self that LinkedIn is an "excellent service", especially after their disastrous 2012 database hack, which is when I deleted my account there.