For long, I had been thinking of some utility to add events to calendar easily, without having to open the calendar. I found gmail provides this feature but again not always you have your gmail open. Thankfully, google has provided calendar api which helps create events very easily that too with just a browser. I find an application based on this quite handy and non-bulky ( http://torrez.us/archives/2006/04/18/433/). I am not sure if there are better applications already present but this one is quite helpful.