Any thoughts on the frequency of updating titles? For example, lets say you sell widgets and have a Rare Blue Widgets page. What if you put the inventory count in the title and updated it as inventory changed? For example:
Rare Blue Widgets (4 available)
Rare Blue Widgets (3 available)
and just "Rare Blue Widgets" when the product is sold out. This is useful information to the user because they know that you've got rare blue widgets in stock. You could also do something with the price, for example:
Monday Title: Rare Blue Widgets for $19.99.
Tuesday Title: Rare Blue Widgets Special Offer - $14.99 Today Only!
Wednesday Title: Rare Blue Widgets Extended Sale - $14.99