gtasks is in beta form, but works well with the droid and syncs with google tasks with relative ease. It also has a 2 x 2 widget that you can put on your home screen that displays your notes.
For a more sophisticated planner, I recommend either ActionComplete, or Astrid (both free apps). These two apps have the ability to set long term projects or tasks, and Astrid can sync those tasks with your google calender. Astrid also ha a widget, which displays your tasks and they can be as general or as detailed as you want. ActionComplete has a task specfic location feature that uses your GPS to calculate your position and remind you of a related task. This feature, however, does drain you battery more quickly, and does have a slight learning curve(AC provides an instruction manual on the developers website). Moreover, this feature mimics the one found on remember the milk, which requires a $25 annual membership fee once the free trial expires.
Another useful app that I use is called CalWidget, which syncs to your gmail calender and displays your agenda in a 2x1 up to a 4 x 4 home screen widget. It is more useful than the default calender widget because since you can customize the size, in essense you control the amount of information that is displayed off of your calender.
In all I've tried the following task/to do list apps:
3bananas
Note Everything
AK Notepad
Rememberthemilk
Astrid
ActionComplete
Gtasks
My favorite is Astrid with Gtasks and ActionComplete both coming in at a close second. ActionComplete would be 1st; however, it does require reading the instruction manual to get familiar with all its features and terminology. If you have any questions about any of the other apps let me know. I've tried them extensively, because I'm a college student and have been looking for a planner/task list that is both straight forward and easy to use.