One that has gained momentum but is relatively unknown still this year is keyword trading. There are a few companies that are doing it with one I have made a hub about is just starting. They have just announced that they will match deposits up to $50 for people joining now, so that's gotta be the easiest way to make $50 I know of.
I've made a lot of money with another company that I ended up basing a website on. Check it out http://KoodayOnline.com is my site.
I have tried a lot of things before and still do but the keyword trading has been the most fun, easiest and most profitable so far.