So I just did the NetFlix's offer (I've had them before, but I canceled a few months ago, then moved so I was valid to take it again). It starts a 1 month trail before your card is charged, so it might take up to two months before this one posts :-/
The email I got from them had this:
"Special Offer:
31 Day Free Trial"
I *really* hope I get the miles out of this ... (would it kill them to send a confirmation email?!)