From what i've seen, people seem to be making pretty good money with that "Type At Home / Data Entry" thing. Where they make a whole website telling you how they make a bunch of money every month just typing at home. Then, when you sign up for it, it turns out they just send you instructions on how to do exactly what they're doing, posting ad's for "Type At Home / Data Entry" positions and tricking people into buying it. Yes, yes, I bought into it. Luckily it wasn't one of those $99 deals, i'm too cheap. But if it had of been, I would have gotten ripped off badly.
if you've a website or a blog of your own which has regular visitors in decent numbers then you can earn money by advertising in your site. I'd recomend Google Adsense for Ads.