I found Freebie Jeebies to be a great place to get free things. One of those items is an
Xbox 360 slim

It only takes 3 steps, and requires completion of fewer offers than any other site I have found
1: Sign up
2: Complete one offer.
There are free trials to sign up for to keep it completely free
3: Refer your friends

consoles.freebiejeebies.co.uk

This is Proven and Confirmed By –
BBC News Night
T3 Magazine
CNN Tech & Gadgets
The Gadget Show
Also you can find plenty of proof videos on YouTube