Free Points, Miles, and Cash

Many rewards programs offer ways to earn rewards (whether points, miles or even cashback) via activities other than shopping online. Below are a few of these offers - it doesn't hurt to join all the rewards programs mentioned as you can earn the free points in all of them to top up rewards you earn for shopping or to get rewards only for free activities.
USA
MyPoints gives free points for reading emails and completing surveys.
InBoxDollars.com
USA
InBoxDollars offers free cash for reading emails and completing surveys.
SendEarnings.com
USA
SendEarnings offers free cash for reading emails and completing surveys.
QuickRewards.net
USA
QuickRewards offers free cash for reading emails and completing surveys.
Memolink.com
USA
Memolink offers free points for reading emails and completing surveys
FreeRide.com
USA
FreeRide offers free points for reading emails, completing surveys, and visiting websites.
QuizPoints.com
USA
QuizPoints offers free points for completing surveys.
Phonehog.com
USA
Earn free long distance minutes from reading emails and completing surveys.
Emailcash.com.au
Australia
Emailcash offers free points for reading emails, daily quick surveys, and daily web clicks.
iPoints.co.uk
UK
iPoints gives free points for reading emails.
MutualPoints.com
UK
MutualPoints offers free points for reading emails.
emiles.com
USA
Earn Delta Skymiles for answering surveys.
Live Search Club
USA
Earn points redeemable for airline miles, microsoft products, and other goods by playing online games.
Survey Sites
Survey sites offer cash, prizes, and/or sweepstakes entries for completing online surveys. You can maximize your returns by joining many/most/all of these programs. You should NEVER be required to purchase goods or services by a valid survey site - be extremely cautious of any site that does.
Opinionplace.com
USA
Earn American Airlines AAdvantage Miles, AOL credit, or PayPal payments for answering surveys.
eRewards.com
USA, Canada, Belgium, Denmark, France, Netherlands, UK
Earn airline miles or gift certificates for answering surveys.
Opinion Square
USA
Offers sweepstakes entries and points redeemable for various prizes for answering surveys.
Greenfield Online
USA
Offers sweepstakes entries and points redeemable for various prizes for answering surveys.
Lightspeed International Offers points redeemable for cash and prizes.
ECN Research
USA
Offers sweepstakes entries and prizes.
Permission Research
USA
Offers points redeemable for gift certificates in exchange for monitoring your internet purchasing behaviour.
Nielsen/Netratings Installs net usage tracking software to compile internet ratings. Offers points, cash, and free downloads.
Opinionistic
UK
Receive cash, prizes, vouchers, free draw entries, points etc.
Survey4Profits
USA
Receive cash.
Ipsos i-Survey USA Receive chances to win various prizes.
Australia Survey Panel Australia Receive cash and prizes.