seonet - 8:30 pm on Sep 2, 2008 (gmt 0)
-If you have listings deeper then 3 levels, SE will most likly not give them to much importance or even don't include in SERPS.
-Do not use script generated URLs, there is a great value in using keywords in your urls
-Don not use more then 50 links/page as SE can see it as link farms
Good luck Spirit with your directory