Hello Bernat,
I have worked with the Google Calendar API. The way this works is probably very similar to Google Docs.
The hardest part was implementing sing-sign-on using OpenID2 and using OAuth to access private calendars. The other stuff was just processing XML. The OpenID2 and OAuth code I used is available in the Cloudfork-OpenID2 package on SqueakSource. Note that this is still alpha code. There is no clean interface yet and it is poorly documented.
Jan.
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