I'm new at this but there's also Buzzle, SearchWarp, ArticleDashboard. Anyone could correct me if those don't get good traffic for them.
There are LOTS of sites, not just article directories. There are web 2.0 blogs & other auto approval sites, video sites, feeds, QA type sites, forums and many others..
People think they'll put the same article on 10 article directories and money will come flooding the front gates!
You can't expect to make money submitting the "same" article everywhere. And its something people rarely talk about. I saw your thread where you talked about the exact method to get sales. I do provide SEO services to various private clients. Everywhere, we find people suggesting others to spin the articles before submission but you have to know how to spin and make them good enough & unique enough. Its not easy work.
SEO is a lot more profitable.. But you might be well of just submitting articles to a few solid article directories.. And if article marketing is your main source of traffic then don't forget to put PRLOG.com on your list. Al./