Does it hurt to have multiple URLs point to the same site?
I have a primary site http://freedjamerica.com which I currently have several other URLs pointing to i.e; fdja.com, fdja.net, fdja.org, freedjamerica.net, freedjamerica.org.
I also have 2 sites which don't get much traffic (less than 100 uniques daily), http://find-dj.com and http://hiredj.com
If it won't hurt my search rankings, I would like to also have those URLs point to my primary site.
I have read conflicting opinions regarding redirects and the effect on search engine ranking, so what's correct? Does it hurt to have multiple URLs point to the same site? What if the URLs are being submitted to search engines, or have been in the past?