It turns out there's some security issue with the WP-Cal plugin. Please download the new version of the plugin here.

IMPORTANT!: If you've downloaded the version 0.3 of this plugin from my site, please update to version 0.4 because there are some security issues with the original plugin!

For some time now, we're using the wp-cal plugin on Ochblog. It really is a great plugin, once you've got it working. To bad it's just a nightmare to get it working properly. I don't know how many adjustments I had to make to the code to get the thing going, but it finally works now. Since the original plugin writer seems kinda busy doin other things, it's now available for download here (version 0.4).