Use automated submission software or something. I think there is one called articleannoucer or something like that.
There is a decent one called "Article Submitter" You can find out more by going here: http://www.dawgebooks.com I have it installed, but Yet to use it as I don't write articles.
Email them to me and you can have it sent to 240 sites within hours. Its not the cheapest but its pretty fast.
Hey duclelo, I M Using http://articlesender.com/ it is working best for me. and they are free. they can submit your article to about 25-35 article directories.
I've tried article post robot. rudimentary on-page architecture and needs about a day to set up (you have to manually register for all the sites) but does the trick. Crucially, for me, you can control how many sites to send articles to, rather than some loose cannon scattergun approach.
..forgot to say as well.. directory maximizer do article as well as directory submissions. I'm trying them at the moment too as they're pretty affordable.