www.businessarticles.org is another good one.
The thing I find is that, at least for me, many of these sites aren't the easiest to find, google only yeilds two or three that accept submissions in the first three or four pages, in New Zealand there's four or five in total. Part of what I do at
Learning4ever is write articles, though it's slow going at the moment since I'm busy interviewing people for a series of them.