How can I see my past iTunes billing on my IPAD? I was charged last weekend and never bought anything.

Login to http://reportaproblem.apple.com. You will get a list of your purchases made in the last 90 days.

You can report issues with the purchases directly from there.

I've seen two posts today regarding a phony billing email from "apple"

Identifying legitimate emails from the iTunes Store - Apple Support

contact the financial institution you use and see if any charge was made to your credit card assigned to the account.