If you are looking to spread your content (and links) across the internet, don't rely on someone to do it for you... unless you pay someone to do it for you .
Use all of these sites and others. If your purpose is SEO and links... even direct traffic... you need to be blasting these everywhere you can.
As far as ezine articles. It is WELL worth it. The traffic from there alone is enough to build a solid business around, without the SEO benefit of the articles. When you consider you get both, you cannot lose. Learning to write to their approval is well worth any potential issues you may have in the process. If they approve an article, everyone else will as well usually... unless there is another issue like length that is an issue (some other sites have minimums, or maximums).
Use all of these sites and others. If your purpose is SEO and links... even direct traffic... you need to be blasting these everywhere you can.
As far as ezine articles. It is WELL worth it. The traffic from there alone is enough to build a solid business around, without the SEO benefit of the articles. When you consider you get both, you cannot lose. Learning to write to their approval is well worth any potential issues you may have in the process. If they approve an article, everyone else will as well usually... unless there is another issue like length that is an issue (some other sites have minimums, or maximums).