Is there a way to submit your site to all of the directories at once for free without having to register with each one, one by one? I have been trying to register my site for search engine optimization and it is a lot of work registering with each directory individually.
I don't know what you mean by "registering" but you can choose autosubmission software or use a submission service. It's best to do them individually however, to speed up the process try semiautosubmission software like informenter.
I don't even bother submitting my sites to the search engines, you'll just be spammed and they will ask you to upgrade. Directories are much better approach to getting backlinks for your website and most are free and most do not require registration.
if you want it all free and easy, go and pay for the submision services. there are a lot of people on dp, that provides these facilities, just pay them, and leave this work for them. you don't have to do a thing, just enjoy the backlinks and traffic!!
Most "top" directories will decline automated submissions. That is a submission with the same description used for all directories. The description must be somewhat unique for every directory, otherwise they see it as a kind of spam. Hugo
There are some directories which require registration... But most of the directories dont require registration... And yes you should and have to submit one-by-one only.