Sticky Notes is one of those features of Windows 7 which have impressed users big time. I have a friend who is a complete Linux fan, and always prefer working on Linux machines than any other. But, once he used Sticky Notes on Windows 7, he wished if he had similar Sticky Notes apps for his Linux machine.
So, if you have a similar story or regardless the story if you are looking for Sticky Notes alternatives for Linux, then here is the list for you. All the apps are meant for taking notes, and are basically the widgets for your Linux desktop.