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1. Use redirects for any reason
2. Show duplicate content
3. Use session ID's
4. create lots of pages that have very little content
You may also want it to have search engine friendly URL's. You can still do well in search engines with URL's that have?, &, and = signs in them. The 3 things listed above are the ones that will hurt you.
There are also analytics programs that include CMS - this you could tie to conversion info etc and have changes made on the fly with the right - though often expensive ones.