I really like the stickies that come with OS X. I know there are some more advanced "to do" lists, but I kind of like the simplicity and solid design / ux of the native ones.
How can I synchronize stickies between Macs?
How about using Notational Velocity instead?
alternate (newer, better maintained): http://brettterpstra.com/project/nvalt/
Take a look at this app:
It looks just like stickies and has the functionality that you are looking for. And it's free!
Hope it helps.