Use article automatic submission software. Freeware and shareware are available for this kind of software on the Internet.
you can either submit yourself manually, use tool to submit, or outsource your article submission. whichever method works for you. if you use any article submitter program, make sure you have a good list of article directories as the list your tool will come with will be pretty much useless. submission tool also has some limitations where you cannot always select the right category and lot of your submissions may not go through as the tool will not be able to read all the submission fields on every single article directories. if you must use a tool, then i suggest you submit to the top article directories manual as no tool will be able to submit to those sites due to their custom features
If you do these submission regularly, you can increase your speed a lot. I won't advice using automated submissions, instead outsource the work to someone who can do it at a much cheaper rate.
You can use a serviced called "SubmitYourArticle.com". They do manual submissions to all the main directories (EzineArticles, GoArticles, etc) as well as a bunch of others. For the monthly cost, its well worth the time saving.
I think manual article submission is the best. Because it is very effective. If you want good result. Than you should do it manually.