I am a member of CashCrate.com and have made a lot of money thru them (see a screen image of my account below).  
Much like InboxDollars, you get paid to complete offers and fill out surveys. Also like InboxDollars, I get a bonus for everything you earn and you get the same for people who sign up as a result of your referrals.  Simply click on one of the banners below.

One of the only downsides is sometimes you don't get credited for something you do; but if the advertiser doesn't notify them of your participation in a survey or offer, cashcrate isn't going to credit you. Most of the time it goes thru fine though.