SPAM Prevention/Blacklists

Greetings from Wyoming -- Just a real quick question for the folks on the Nanog list: We are using the following RBL's on our MTA right now: Spamhaus (sbl-xbl) DSBL NJABL (dynablock) Are there any other good lists out there that you folks have had good experience with? Any that we might want to consider taking a look at? Thanks, Brandon