GSoC is going to end and we will have a taste of some wonderful development done during this period. One of the apps that experienced a major facelift is Getting Things Gnome, a Todo and Tasks apps for Gnome. Finally this app has a Gnome shell extension that integrates its nicely with the desktop.
You can install the extension from here.
The app also allows you to search tasks from the Gnome shell overview. Getting Things Gnome also features a good notification system which is currently being worked upon.