Swagbucks claim to be one of the largest online rewards portals, helping users earn gift cards, electronics, and exclusive Swagbucks merchandise. Swagbucks can be earned by shopping online, making searches using their search engine, taking paid surveys, daily deals, completing trial offers, or playing games.Swagbucks has awarded over $30 Million in prizes including Amazon gift cards, electronics and more to users across the US, Canada, UK, Ireland, and Australia. Swagbucks seems to be very similar to InboxPounds, in that you get paid varying amounts of what they call ‘Swagbucks’ for a variety of different activities including; Cashback Shopping Making Searches Taking Surveys Playing Games Completing Offers Watching Videos One you have earned ‘Swagbucks’ you can they exchange them for Amazon Gift Certificates, High Street Vouchers or Paypal. Remember the program is only open to residents from the US, Canada, UK, Ireland, and Australia.
Get more info/join: Swagbucks

Edited to add – 9th September 2014:
Just a little update on this program to confirm that they do pay.  We know sometimes people are a little dubious – just as we are sometimes! 

We’ve found that the more you stay proactive on the site,  points build quickly.  We like to take a lot of the surveys, and there is always a good handful on site everyday.    In other words you do not have to spend money via shopping to earn on this site, but of course you can if you want. 

As a little confirmation, here is a screenshot of some of our recent payments/gift cards – obviously some months we are more active than others, but if you do stay active you can earn pretty regularly.  If you are from the UK as you can see you can get Amazon UK vouchers, US residents can get them in Amazon US format plus of course you can opt for cold hard cash via Paypal!!