Nomenclature:

A leaf is a check-in with no descendants.
An open leaf is a leaf that does not have a "closed" tag and is thus assumed to still be in use.
A closed leaf has a "closed" tag and is thus assumed to be historical and no longer in active use.

Open leaves:

2010-06-20
14:45		[9ee30cfc32] Leaf initial import of erlene files (user: jeffr, tags: trunk) [timeline]