Since it's the closest post to the top that I can edit, I'm going to hijack it to provide the latest download link for SpinZip. I had a report of the links pointing at autohotkey.net not working properly so please use this link instead:
SpinZip v0.0.9.0~ORIGINAL POST BELOW~
Here's a quick-n-dirty script. Unzip the attached file to its own folder and run sri-zip.exe (or sri-zip.ahk if you have AutoHotkey installed). A folder dialog will pop up, select the folder that contains the files you want to zip and click OK. There's no GUI (except for the tray icon) so a message box will pop up when the app has finished running and you'll find your zips in a "zips" sub-folder of the one you chose when running the script. Currently, it does no recursion through folders (all your files must be in the folder you chose at the start) so if you want something more configurable, just ask. I can write up a GUI for it in no time. Let me know how it works for you.