I've finally got this running.
I spent a bit of time with it last night and found that the dshield.cnf file had some errors.
I still need to tune it, though, because the script is reporting non-malicious web traffic to Dshield...I'll need to exclude all non-attacks and non-probes.
On another note, I'm at home today since we're getting FiOS installed. This service will replace Direct TV and Comcast. I'm looking forward to a dedicated internet connection. I'll be getting the 25/15 (down/up) internet pipe (YES) and two DVRs (I hope to replace the circa-2003 Tivo soon, with something better).