There are a number of handy calendars you can integrate into Windows Live Calendar.

First up is the Facebook Birthdays calendar. This is useful for cross checking birthdays in contacts or missing altogether. Just add the application here then follow the instructions to get an iCal link. Subscribe to the http version (webcal version is linked in fbCal) of this in Windows Live Calendar.

Next is Last.fm’s gig calendar. With the upcoming integration in Xbox Live, interest should grow in Last.fm. You can get an iCal URL on your profile’s event page, webcal://ws.audioscrobbler.com/1.0/user/<username>/events.ics to be precise.

Finally is a weather forecast for the next 7 days. Go to http://www.wunderground.com/ and search for your city. There’ll be an iCal URL on the results page. Dublin, Ireland is http://ical.wunderground.com/auto/ical/global/stations/03969.ics?units=metric