FYI, if you have hulu, I find that reward to be a better "rate" of return. It's 475 gold for $5 amazon credit, or 420 (gold) for a HuluPlus one month credit ($8). That's a cost of 52.5 points per dollar or 95 points. You can add it to an existing account - it doesn't have to be a new account.
Not sure about the bonus people are talking about but I have:
15 PC, 10 mobile (which I don't use), 1 random point a day, 3 trivia every so often (maybe weekly?).
In 3-4 months, using exclusively it at work (although I'm going to start using it on the weekend at home) and not much the first month, I've earned 1026.