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If you have good navigation and hard links pointing to your importaint pages then a dynamic site will be crawled well. Then dynamic pages will count as back links to pages they link to.
Mack.
Search engines have, in the past, had trouble spidering dynamic content but from what I have seen for myself, and read (on this forum), Google and other SEs are getting better at this. Once the page has been found Google should treat the page like any other piece of HTML it has found.
The most probable reason those backlinks are not showing is that their PR is too low to show on the toolbar.