Another nice refinement in the latest Tinderbox is in the map view. When a note contains text, Tinderbox draws a dog ear in the corner of the note. Now, the background color of that dog-ear reflects the note's age.
Fresh notes are a very light, pale blue. After a day or so, the note
“dries” to white. Then, over the course of a year or two, it gradually
ages to a pale, golden yellow.
The colors are sufficiently subtle that they don't dominate the
display, but they change just enough to let you know what's new and
what's old. They've been available in Tinderbox outlines all along, but
in Tinderbox 2.4 they're now visible in maps.