i used to put stuff on helium, but they banned me.
i had about 40 articles, and could make $50 per month, i had them linked into my blogs, etc and would use myspace (before it was broken) to drive traffic there. they told me i was banned, didnt offer any explination and kept my articles. i tried to appeal, but they didnt listen. ive heard a lot of stories that if you actually make money from them that they just ban you and keep your stuff, so watch out. thats what happened to me, i did get about $400 from them though!!!