jdow pointed out problems with the prior rules for SA 3.0.1+. These ones should work:
urirhsbl URIBL_SC2_SURBL sc2.surbl.org. A 127.0.0.2 body URIBL_SC2_SURBL eval:check_uridnsbl('URIBL_SC2_SURBL') describe URIBL_SC2_SURBL Has URI in SC2 at http://www.surbl.org/lists.html tflags URIBL_SC2_SURBL net
score URIBL_SC2_SURBL 3.0
urirhsbl URIBL_XS_SURBL xs.surbl.org. A 127.0.0.2 body URIBL_XS_SURBL eval:check_uridnsbl('URIBL_XS_SURBL') describe URIBL_XS_SURBL Has URI in XS - Testing tflags URIBL_XS_SURBL net
score URIBL_XS_SURBL 2.0
Jeff C. -- Don't harm innocent bystanders.