When I see the use of glob I often feel compelled to point out that it has its caveats, such as how it handles whitespace in its argument, and also that it does not list filenames beginning with a dot by default (which might be surprising to users when compared to readdir or File::Find). A thorough read of glob and File::Glob, which implements the former, is recommended.
Update: While File::Spec is often very good advice, I looked into this a bit, and note that the File::Glob doc discusses how on Win32, backslashes can interfere with escaping, and that forward slashes are recommended.