One of the most powerful features in Tomboy is inter-note linking. This is something Stickies can't do, and it turns Tomboy into a powerful knowledge management system a bit like TiddlyWiki. Often, you don't even have to think about creating links: Just type the name of an existing note and it automatically turns into a link, with no double square brackets or any other formatting. If you ever rename the note you linked to, Tomboy will offer to rename all links to it, so there are never any broken links. It is also easy to create new notes by linking to them: Select some text and press Ctrl-L. The text you selected becomes a link, and you find yourself within the new note, ready to write. Tomboy stays true to the Wiki format by optionally supporting CamelCase: It can turn words melded together LikeThis into links.
Once you no longer need a note, just close its window and Tomboy will store it for future reference. If you ever need it again, you can click the Search button on any other note (or press Ctrl-Shift-F) and open the Search All Notes window. Type any fragment of text into the search box, and Tomboy searches all notes (both open and closed), as fast as you can type.
Apart from its clunky two-part installation process on Windows and slightly quirky hotkeys, Tomboy is very easy to get started with. Instead of reading lengthy explanations and tutorials, you just suddenly find yourself writing whatever it is you wanted to write, while Tomboy stays out of the way.