Yeah,
I've got it already by way of my Handspring treo!
I develop automated testing at work, and wrote some automation that pulls the weather forecast, and creates palm datebook entries on my pc (complete with Datebk5 icons).
When I come home and sync my Palm with my iMac, the weather gets updated into iCal...
It would be greate to have this just built into iCal though!
Here's a pic of my iCal & my Palm...
http://homepage.mac.com/georgecs/icalweather.gif
George