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  1. A couple of thoughts - expiration (life span) and ease of use.

    Given ease of use as a factor (how hard for users to type in if they can't puzzle out copy and paste) and setting an expiration (n days on m population of codes) you could well manage with 4 characters... which is readily available in the form of a Note document ID for those writing Domino based applications. I've used this for a url clipping implementation where the short urls are not long lived and it gives me plenty of usage. I might go to 6 just to extend the life span of the urls out a bit or even 8 would do if I wanted them to live on for almost-ever.

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