<title>tag. It ain't always that descriptive... I wind up with a folder half full of files called "DATE-TIME-Receipt.pdf". So now it'll propose a filename and present a small dialog to confirm or modify it before it saves your PDF. You can also change the location and the name of the folder where it saves things, it's the last action.
The latest version is on my web server. Unzip it into $HOME/Library/PDF Services for your own use, or to /Library/PDF Services for global system use.