Sure enough, I was. To print multiple files at once in OS X land, just open up Terminal, navigate to the directory with your images, and use the lpr command, using a space between file names! lpr img023.jpg img024.jpg img025.jpg img026.jpg Couldn't be easier. Even scaled each jpeg to an 8.5"x11" sheet for me. Thanks heavens.
[robg adds: If you'd like to skip the Terminal, here's the Finder solution: just drag and drop the group of images to be printed onto one of the printer icons in your user's ~/Library/Printers folder. You can even drag a printer from here to the dock (or alias it on the desktop) for fast permanent access -- this is basically what the "desktop printers" feature in 10.3 does...]

