http://www.peapod.com Looks like an online grocery store.

i thought it was some sort of mathematical sorting mechanism

By now other people have answered the question of what it is.

I use peapod every other week. It probably saves me an hour and a half each time--it's pretty cool.

It was a very hot web start up back in the 90's it was since bought out by some brick and mortar grocery store.

The largest online grocery store.