Not many DHCP servers support the insertion of Option 82 information so you will probably want to disable this feature:
no ip dhcp snooping information option
Certainly if the servers are Windows 2003 or earlier then they definitely won't work if this is enabled. Other than that Toshi's reply is sound - trusting needs to be on the layer-2 uplinks and the port where the actual server is connected.
Option 82 insertion is where the switch inserts the physical interface information into the DhCP request along with the source MAc address. I think it is more useful in a cable/broadband network where you want to know more information regarding your subscribers.
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