PDF - http://www.ussc.gov/booker_report/Booker_Report.pdf
"Rather than leading to more lenient sentencing, the median sentence length in the year following Booker actually increased. The median sentence increased from 33 months to 36 months in 2005, and a higher percentage of all persons sentenced went to prison (88.6% vs. 85.9) rather than alternatives to incarceration. Some of this increase has been attributed to stiffer sentencing penalties for theft and fraud, which underscores that even under an advisory system, Congressional mandates regarding sentence length are not being thwarted by judicial discretion."
