If you're thinking of changing your gas, electricity, mobile, Internet or telephone provider, or planning to make a big purchase (a big tv or a heft order of Christmas presents perhaps) then you should sign up to Top CashBack before you do it.
I did, as I was planning on changing my ISP and telephone provider to a cheaper combined package from Sky anyway. By switching over through Top CashBack I got £20 cash back after I'd switched, as well as saving ~£15 per month due to the cheaper package I'd changed to.
To be honest, I didn't think the promised cash back would actually materialise, but there's nothing to lose so I gave it a go. To my surprise, it did materialise, and is in my bank account right now.
If I changed my mobile phone provider and gas / electricity provider, I could save money on my bills and get something like £100 cash back too (unfortunately I'm locked in with Orange for a good 6 more months or so, alas, and my gas / electricity comes through key meters so the switch deals aren't so good...still worth considering though!).
It takes a while for the cash to come through, over a month for me, but that's fine. If you're planning to change providers anyway, you may as well do it through Top CashBack as you've got nothing to lose, and could get a nice bit of cash for doing what you would have done anyway!
I also got £1 cashback for signing up to get a free SIM card... I haven't used it yet, and probably won't, but being paid £1 to be given a free SIM card is quite nice :)
They often have offers for major online retailers, so before you make a purchase of Play.com or Argos or whatever, check TopCashBack first - you might get some money back, just by clicking through to Play or Argos via the TopCashBack link.
It's money for nothing, so if you want to earn cash back on your Christmas shopping, or want to switch to a cheaper provider for something and get paid to do it, sign up with Top CashBack.
Sign up through my link - http://www.topcashback.co.uk/ref/Alltruism - and I'll get money too*, win-win!
I've made £26 so far, just by doing purchases or switchovers I was going to do anyway. That's not bad at all considering I probably spent less than 10 minutes of time signing up and using the Top Cashback site!
* well, I will get £1 when you get your first £5 back, but you'll probably get a lot more than £5 if you just switch one utility provider, so getting to the £5 threshold should be quick n easy :)