Out of 49 apparel sites, 21 had some form of prominent free shipping offer on the home page.
Here's a slide show of the websites on 12/1/07.
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Here were the various thresholds
White House Black Market
New York and Company
Easy Spirit - for email subscribers only
Ann Taylor Loft
Gap (4 brands. But not Banana Republic or Old Navy)
The 17 department stores shown below were more likely to have free shipping.