Sorry to hear about your computer. I still can't find an original thread about MyPoints, so here's the basics.
MyPoints has been around for a while (longer than SB I think), so it's pretty reliable and well-respected.
They have a limited number of prizes (gift cards) for Canadians, including $25 Visa prepaid gift cards. They don't have Amazon.ca cards, but they do offer Amazon.com cards.
Prizes cost several thousand points and it will likely take you several months to a year to get enough to redeem for a $25 gift card -- like I said it's slow but steady.
If you download the MyPoints toolbar (it's like the SB toolbar) and do 30 searches in a month, you get 75 points. It's a pretty easy way to earn, since each search you do counts towards the total.
Outside of that, you can do offers which give you 5 - 50 points each, do the occasional review on websites through Frogpond (25 points each) and earn points by shopping.
Plus you can get points for referrals like I mentioned - 25 points for each person that signs up plus 10% of whatever they earn.
Here's a link to their FAQs which may also help:
https://www.mypoints.com/emp/u/help.vm
If you are interested in signing up, you can do so directly or you can sign up under someone to help them out. If you'd like to sign up under me or want more info, feel free to PM me.