With iCal being slow but pretty there remains the question on how to use the calendars on the web. Apparently there's an answer coming up to that question called PHP iCalendar. It makes having my Calendar as a webpage as simple as uploading a file. This seems like a good time for being happy that we forked out those few extra Euros to have a web server with PHP capabilities.
Received data seems to be invalid. The wanted file does probably not exist or the guys at last.fm changed something.