Hello, idiot here.
When I discovered that OGRE was using zzip instead of zip, I made the (incorrect) assumption that it would require using a different program (than zip) to create the Zip archives (I'm using Mac OS X). So, I went looking for a project site that would contain an executable program I could use to create my archives.
Lo and behold, I found one. It was 3-years out of date, and claimed that Unix support was broken (and hence, OS X, since it's BSD at its core). Nevertheless, I attempted to build the program and found that it was indeed broken.
Well, this morning I discovered
another zzip project on SF, thanks to a link I found while searching these forums. It's up-to-date, and will still read my standard Zip archives.
So, I feel pretty stupid now, but lesson learned (do more searching on the forums first!

).