I completely agree with burrum.  I think tag counts would be very annoying in tool tips, but shown in the interface (as per his mockup) would be extremely useful.  The lack of this feature is really the only thing left keeping me from switching away from my old evernote3.1 install (which I am eager to switch from) 

I just got an ipad and would love for cintanotes to have this functionality.

The other windows clients for simplenote don't look very appealing after using cintanotes for so long.

Also, I found cintanotes not being natively cross platform to be it's biggest drawback, which this would negate.

I think Cintanotes will quickly become the windows simplenote users favourite client - which would be good for the program as it would generate more income with the commercial version.

I think that, if this is implemented, Cintanotes should still keep it's option of syncing the local db through dropbox. Can't have too many backups :)

One concern... when categories/tabs are implemented will notes:

a) all sync somehow, using some sort of special tag for categories

b) user selects a category to sync to simplenote. Other categories are not synced (my preference)