Jeff,
I'd like to hear what anyone else has to say before we pull the plug on ds though.
For every 1000 spam hits on SC/WS/OB.surbl.org DS only gets 100.
I haven't yet seen a real world spam hit in DS that wasn't in one of the other lists.
Over the last few weeks I have had it in our systems it's running between 4 and 5 percent FP.
Personally I'm inclined to think it is a waste of resources. The dynamic data on SC, and the ability to submit to WS make those lists a lot more attractive and worthwhile.
Regards,
Joseph