The Stanford IP Litigation Clearinghouse is referenced in an article in American Lawyer about a decline in patent infrigment cases in 2008. The American Lawyer writes:

Conventional wisdom holds that in tough times, companies look to IP litigation as a way to extract more value from their assets. But in this unprecedented economic disaster, does the logic stand up? For IP litigators, there are some discouraging signs. The National Law Journal reports that patent infringement case filings dropped last year by about 8 percent from 2007, according to Stanford Law School's IP Litigation Clearinghouse. That jibes with findings from the 2009 edition of Law360 Almanac, which found an 11 percent decline in IP suits in 2008.

According to the Stanford data, the biggest drop came in the last five months of 2008, when filings fell 23 percent from the same period in 2007.