I don't spend a lot of time trying for freebies, mostly because in Canada there are some - but they are few and far between. Here are two programs that I participate in:
Swagbucks - available in many countries, simply use their search engine and gain swagbucks. I turn these Swagbucks into Amazon.ca gift certificates and save them up for Christmas. Right now I have $30.00 in Amazon.ca credits. I like Swagbucks because you can participate as much or as little as you wish. The secret is take their daily poll for one Swagbuck and search at least 3 times per day and you will end up with another 7-10 Swagbucks per day. I have little time for this so choose the easy way. Minimum take $5 to $10 in GCS per month. Canadians are very limited on their GC choices but if you are American your choices are much wider. Last year I ordered a book written by a friend of mine as well as a large box of Keurig coffee - both 100% free just for using their website. If you are worried about spam from them - don't. They only send you about one email a month about upcoming promotions. I have used their website for three years now and will definitely keep up as it makes it much easier on the pocketbook come Christmas time.
The second is icoke.ca. If you live in the USA you could go to mycokerewards.com.
Although I generally only buy no name pop with four teens in and out of our house we often find Coke bottles gracing our recycle bin - check those liners! I got a full year subscription to Country Living magazine this way - my favorite guilty pleasure of late.
What are your favorite freebies?