I think this has been mentioned before, but couldn't find a proper post so I thought I'd make one.
I found out about this thing on reddit's Beermoney sub. It's a 'get paid to view adverts' deal but you can get up to five scratched up phones (Android 4, iphone 4, tablets and ipods also work) earning giftcards for you. 5 devices per person (multiple accounts per household requires ID).
Thing is, it's mostly passive, most people have old phones, or pick them up for cheap on fleabay - cracked screen ones being prime targets. There is a Perk TV subreddit too, with cheap devices of the week.
As always, this is best for Americans - the rate of earning is higher - but it works ok in Canada too.
I currently have two devices running, and getting a $5 Amazon gift card took 4 days. Two more phones on the way so theoretically $5/2 days = $75 a month.
You can clear $1k a year with this. Shove phones in a drawer (connected to wifi and power!), look at them every few hours to confirm you are still watching/phones haven't frozen.
I was skeptical, but I've got $10 of Amazon credit so far (also available Walmart, Starbucks, etc).
Referral link:
http://perk.fm/4j4ffNormal link: perk.com
Some people on the reddit sub were saying that this is basically free/play money... to get entertainment. If we only lived in the US I'd be using this for toilet paper and chocolate bars frm Walmart or Amazon! As it is I'll probably do one order a year to family in the US... or just get the odd thing that can be shipped up here.
I have no idea how long this will live for. It's a low earn rate per video, but it just chugs along. Oh yeah, it uses bandwidth (obviously) - you can set to low bandwidth, and it chews about a gig per device per day, I think.