Org mode has an option of “comefrom” links similar to Tomboy and Howm, called “radio targets”, but it’s frustrating that you have to mark them specially. I sometimes wish every header could be a radio target.

I only used Tomboy briefly (obviously it was annoying to have to have Gnome and not be able to just rock out in Emacs) but having fully automated links without any syntax at all, just powered by n-gram indexing, was pretty awesome.