I just wanted to share an app I wrote to simplify calendar and appointments related task like search, groups, filters etc... Its a free app for now. Please take a look and provide feedback about what else I shall include going forward.
Further details and app are here.

http://windowsphone.com/s?appid=83b8e400-6f66-4e1f-a143-99009185dac3

please rate the app if you like.