We will be removing the data in jp.surbl.org from ws.surbl.org on February 7th.* If you are using SpamAssassin and don't already have a separate rule for JP, then please add one as described in the SURBL Quick Start:
http://www.surbl.org/quickstart.html
When SpamAssassin 3.1 is released, it will also include a separate rule for JP.
If you are using other programs, please check that they are using JP in addition to the other lists in multi. JP is bitmask 127.0.0.64 in multi.surbl.org and it has a relatively high spam detection rate and low false positive rate, so it's definitely worth using. More information can be found on the Lists page:
http://www.surbl.org/lists.html
(* Previously JP data was merged in with WS data because SpamAssassin 3.0 was released before a separate rule for JP could be added. Adding them into WS was a way to get the benefits of JP into SA 3.0. But the lists are better separately because they have some differing data sources and types.)
Jeff C.