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One question though. Weve been assuming that every time we get a favicon hit we are getting a new user who has found our site worthy of a second visit at least. But I'm not sure that it's also counting retrievals for people who have already bookmarked. I guess it would be referred to in the long with a code meaning somthing like (Content already downlaoded) Is that correct? So a favicon hit could mean either a NEW user or an OLD user who just maybe laoded their favourites/bookmarks list?
Woz, we considered this, but in our case MSIe4+ users form a substantial majority of our users.
The best we can do is assume that people using other browsers are of similar demograhic (BAD assumption really as I feel NS has a bigger usage in academic settings and experienced users) and just extrapolate to the whole population and accept that figure as the best available estimate of the proportion bookmarking (with about a .33 level of confidence!)
You can also add a separate icon to an individual page. Use this:
<LINK REL="SHORTCUT ICON" HREF="http://www.mydomain.com/myicon.ico">
You could even do something dynamic, such as when someone bookmarks the site using IE, on the next page they download within a session (1/2 hour on the same IP address), offer them a discount or some other benny. This might require some significant programming on the server, but it might help conversions and make repeat customers. If someone bookmarks the site, they are a very good candidate for making a sale.