Although I won't put the link as an answer here, I have actually written a full guide to this site. You can find it on my profile as:
"How to Make Money with Webanswers.com (Web Answers members earn!)"
I have found the site is easy to earn on, with very little effort required. Just 5-10 answers a day can quickly show results. It takes a bit of time though, personally I didn't see regular money until I was in the hundreds of answers. But, at 5-10 per day that happens quickly and it continues to increase. If you want a lot of tips, please take a moment to check out my guide ... I have shared everything I have found there. However, if you know some extra tips, feel free to share them with us too ;-).
This site is another great one to increase your monthly income with.