It's been a while since I wrote it but I think that as well as installing ActivePerl
you will have to install the Date::Simple perl module. Use the Perl Package Manager in ActivePerl's Start Menu folder to install any modules you are missing.
Once you've added the script as a meter you need to add your calendars to the parameter list. For each calendar there are two parameters: the first is a name for the calendar (e.g. Personal, Work, Holidays, etc.), and the second is the http://www.google.com/calendar/feeds/.../basic
url from the calendar's settings. Just leave any parameters that you don't want to use blank.
You will also want to set the Tab Size in the Display settings to something large. I use 110
Remove "reverse" near the end of the script if you want it sorted the other way.
20090/04/07 Added the above text as a readme.txt file in the zip