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One thing that has come to my attention is the possible problems the redirection links we use to track click throughs on our advertising (AdWords style text) and other items will cause. Anything that is a link to an external URL goes through a internal redirect link so we can track the clicks for the member. e.g. link user sees www.oursite.com/memberitem/ClickingCountingPage user is redirected to www.membersSiteURL.com
People want to put their items links etc with us to help their SE rankings. Will these redirects affect the members number of links to their site counted by Google etc? Obviously if it's not counted as an extra link because of the redirect people wont want to list with us and we need to change how we do this in the new version.
This question has come about from a couple of requests for "direct link" advertising rather than wanting to use our targeted AdWords style ad which we charge on the click through. Makes it very difficult to charge for as they don't want to pay the price for a permant type advertising link.
You should probably read this thread:
Can Google follow a php link in a directory listing? [webmasterworld.com] As well as the threads referenced within.
The examples and experiences that people have posted about seem pretty solid. And depending on how you code your redirects, you may or may not be passing PR to the sites listed in your directory.