Here's some more Short-Term performance data-mining:

In Kiplinger's annual Mutual Funds 2008 magazine they compared the short-term and long-term performance of over 3000 mutual funds.  In one column they used the Oct.-Nov. 2007 correction; it being the very short period October 9 to November 26, 2007.

VFINX...............................-9.5%
VTSMX.............................-9.6%
Average US Stock Fund......-8.3%

VGTSX..............................-5.4%
Avg.Diversified Inter'l Fund...-5.9%

In American Association of Individual Investors latest Quarterly Low-Load Mutual Fund Update their Bear Return column uses the period 11/01/07 to 3/31/08.  (I believe their database only includes about 1445 stock and bond funds.)

VFINX.................................-13.8%
VTSMX...............................-14.0%
Large-Cap Stock Cat. Avg......-14.6%

VGTSX...............................-15.0%
Foreign Stock Cat. Avg.........-15.6%

Coy