FH Technikum-Wien ICAL Downloader for Google-Calendar
Download the google-api-php-client (I used version 0.6.0) from http://code.google.com/p/google-api-php-client and unzip the contents to the icalapp dir.
For the theme I used the simpliste theme by Renat Rafikov (http://simpliste.ru/en/) with the "Simple soft"-Skin (the theme is released under the MIT License)