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When you say index, i am assuming that you mean updating of the database. That being so, this is a list of Updates.
There has been others within the periods above to present, however they were deemed as clitches due to the integration of direct hit technology and Teoma becoming part of Ask Jeeves. Have a read of Brett's article > Teoma, Hits the Ground Running [webmasterworld.com]. Otherwise i suggest reading through all the Teoma posts of the last six months, there is tons of info.
If i have misunderstood, what you were asking, let me know.