Harish, I think you actually need Tomboy.
I am personally becoming more fond of small tools that work together, and focus on doing one thing really well. What would be nice in Tomboy is if it could export its data into a specified url in a mediawiki or such..
I am not really fond of Evolution’s shell that does it all either. Having a set of task-designed applications on top of evolution data server would be much more sane to me.