I use http://searchwarp.com/ and http://www.contenttycoon.com/ alot I generally submit to about 35 submission sites for each article actually though.
I also try to post a free article here on CAP every now n then, in trade for links from CAP members, and I have a submission service on http://www.webaffiliatecreators.com .. you don’t get as many ppl putting the articles up, but you obviously know some gambling sites minded folks are seeing them 
LadyH