I had to look twice when I saw this in the Spam folder of my Google Mail account:

A Web site called Recipe Source has taken out text ads on Gmail pitching recipes whose main ingredient is Spam. The original processed meat product from Hormel. No kidding. There’s even a pair of arrows at the right side of the window that lets me scroll through the whole collection of recipes.
Here’s their recipe for Spam Skillet Casserole. I’ll pass, thanks.
(This is apparently an experimental feature. I checked another Gmail account and it’s not visible. Meanwhile, in my Gmail Inbox I’m getting similarly formatted ads from Engadget.)