Define a note for a group of pages
It would be useful to tweak the notes (via the Configuration page), so that they apply for a set of pages, like:
then any "settings" would not lead to the note disappearing.
Similar case: go to http://en.wikipedia.org/wiki/Leonardo_da_vinci and add a note next to "Childhood". Then open the "Childhood" link in a new tab: your note is not there anymore, since the URL reads now http://en.wikipedia.org/wiki/Leonardo_da_vinci#Childhood.2C_1452.E2.80.931466
Alexandru Tudor Constantinescu commented
Well, the initial URL did not get posted, the second example drives the point home, however. The idea is that changing any settings in the chart on the ariva.de example leads to a new URL (but only the charts are changed) and the postit note is gone. So, for the second case, the definition should read like "http://en.wikipedia.org/wiki/Leonardo_da_vinci*"