Another Facebook offer... become a fan/like/whatever Kraft Foods, and choose one of four free sample packs! They have different themes, but include brands like Wheat Thins, Kraft Mac 'n' Cheese, General Foods International flavored coffees, Kraft olive oil mayo, and more. You get a combination of samples and coupons.
The offer is good through May 10 or until they run out, whichever comes first. Earlier, apparently, the site was kind of slammed, but it seems to be working fine right now, so check it out!