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judicial statistics -- new report is available
Press release:  "Fiscal year 2006 statistics for each of the 12 regional U.S. courts of appeals and 94 U.S. district courts – plus national totals for the appellate and district courts – are now available."    You can read the stats here.

I have used these statistics a few times in support or opposition to motions to transfer to compare how long it takes to get to trial in various districts.