(Be aware that each first link is my own referral link, and the second one is non-referral. Using the referral links would be very much appreciated.)

SwagBucks
(http://bit.ly/1jYuco9  ||  http://swagbucks.com)
Difficulty (out of 10): 4-6
Time spent versus money earned: 1-2 hours a day can easily allow you to send for at least $25 via PayPal each month.

Bing Rewards
(http://binged.it/1n9nyOp  ||  http://bing.com/reward)
Difficulty (out of 10): 2-4
Time spent versus money earned: If you set Bing as your default search engine, you can earn credits by searching as you normally would. 30 searches gets you the daily limit of 15 credits, which would almost allow you to get 500 Swag Bucks (about $5 on SwagBucks). There are several rewards to choose from, but this is my personal favorite.

CashCrate
(http://bit.ly/1f4cg9N  ||  http://cashcrate.com)
Difficulty (out of 10): 4-6
Time spent versus money earned: 30-45 minutes tends to get me maybe a couple of dollars. I know it's possible to make more, but I just haven't had enough time to figure out how to use it to its max potential. The minimum payout is $20.





Part 2 to come soon.

(I hope this series proves to be useful to at least a few people.
If anyone happens to be feeling generous at the moment, BitCoin donations are always welcome: 1M5iAgxH2Y8f5YxtMkFP67jx5eMk3Nx3aA
If not, then that's okay too.)