There is some interesting discussion going on over at SLU about the SLPD and their IP/name gathering orbs and database. Now remember in one of the older posts of the giant thread a leaked chat log shows that Kalel said their system was linked to the SLPD's system. Now this would mean they were telling the truth that PZ does not log IPs but they never said it doesn't link to a database that already existed of IPs.
If you are interested here is a link to a nice meaty chunk of the convo... I'm up to my elbows in it of course.