I'm thinking of implementing a limited version of the various 
"wiki-like linking"
proposals that we've had. Specifically, in Mnemo, I'd look for 
[[text]] sequences, and
replace them with a link to the note with the title "text". So if 
in a note on restaurants
I wanted to link to a note on supermarkets, I could do:

They also sell their food at some [[supermarkets]].

What do folks think of this?

What about the same for Nag in task descriptions? By default I'd 
look for something in
the same application when just using [[foo]], but perhaps we could 
settle on a syntax
of [[tasks/foo]] or [[notes/foo]] for specific cross-app links?