It looks like not much has happened in this thread recently, but I'd like to post on my experiences at Bright Hub. Bright Hub pays $10 an article. They also pay rev sharing for as long as an article is displayed on the site.
You give up all your copyrights to your writing except for the rights to publish and distribute in a physical book or as an eBook. eBooks need to be ad free. So you do not get to republish your work anywhere else on the Internet, but if you had a book deal for a collection of your work -- or, I suppose -- for some of your work in a collection on a theme, you have the rights for that purpose.
Articles at Bright Hub go though a copy editing process, and the CE (contributing editor) is paid $3 an article and gets a 15% rev share from the article, while the writer gets $10 for writing it, and 80% rev share.
The emphasis in all the channels I worked in as a CE was to have quality content that would do well in Google searches- by virtue of the writing, the content, and the evergreen quality of the content, so that people would still want to read the article, sometimes for years. I've worked as a freelance CE since a year ago June, and a freelance channel editor for the last year.
About a year ago I also started writing in several channels. My submissions get edited by someone else, and I have had articles returned to me with requests for additional information, clarification, and to have their length cut.

All of them have eventually been published, and almost all of them get regular views every month. I have had several articles place in the top five in Google searches, and a couple have been ranked first for a few months on that search phrase, and still show up in the top ten. (It can be surprising to have a familiarity with Tolkien's work make money.

Bright Hub is definitely trying to emphasize quality over quantity.
Last month was the most I have gotten just in rev share for everything I have worked on or written, and that was over $70. It has been going up steadily. Bright Hub has been on line for a year in June 2009. I think they have found a viable publishing model.
I hope this isn't too long a post.
I would be happy to answer questions people have about writing for Bright Hub.
Rebecca Scudder
managing editor Language Learning channel
contributing editor Computer and Electronics hub
writer in Languages, Windows, Computer Hardware, and MMO channels