SmartSetr now officially supports automatic updating of SmartSets . . . for the most part anyways.  I can commit to updating everyone's SmartSets at least once per day, however, because of the bandwidth and server consumption required I probably won't bulk update everyone's sets more than once or twice per day.  If you would like to make sure that your sets are all as up to date as they can be then simply visit the SmartSetr site and click "Refresh All SmartSets".  If you haven't visited the SmartSetr site since January 10, 2007 then you will need to visit once more and auto updates will automatically be enabled for your account.

A second feature that has been added since launch is the ability to limit the number of photos that a SmartSet will contain.  This makes it incredibly simple to create SmartSets such as Top 10 Most Interesting, or Top 10 Most Interesting of 2006, etc. that will be automatically updated daily.  The maximum number of photos that SmartSetr currently supports in a SmartSet is 500.  This may increase as I get time to test the Flickr API's limits.