Here's a little list of some stuff I've run across today...

Free Sample of Huggies Pull Ups from Walmart
http://instoresnow.walmart.com/enhancedrendercontent_ektid71356.aspx

Free Scott Tissue sample pack from Walmart
http://instoresnow.walmart.com/enhancedrendercontent_ektid73318.aspx

Free sample of Emeril's Original Essence Seasoning
http://www.bestemeril.com/sample.asp

Free sippy cup when you join
http://juicyjuice.com

Tons of really great free products for business and personal use. Generally just pay shipping on lots of great stuff.
http://vistaprint.com

More to come...