2009/9/21 Russ Tyndall russ@acceleration.net:
My question is: What would cause the touched date to be different from the last revision timestamp?
You were right on the money: the last rev timestamp is the right value to use, not the touched timestamp, because that's what basetimestamp is checked against. The latter is also updated when the page is purged.
Roan Kattouw (Catrope)