There are different ways for submission in every Social BookMarking Site... Like Del.icio.us has to be tagged etc...
I would suggest to create a list of social bookmarking sites and not to forget to add buttons that will help your readers to add the page they like to Digg, StumbleUpon, etc.
Go to http://www.addthis.com/ , put their widget on your website, click on it and add it to many bookmark services. I think you can find other widgets on the internet.
Most of them are easy, just sign up and you will see submit your story or something that regards. Click on it and follow the directions.
if u use wordpress, u can use sociable plug-ins and u need to have an account for each social bookmark sites. Social Bookmarking Sites and Your Website Traffic is my article you can read. or you can visit www.socialmarker.com for mass submission. and you can download the social bookmarking PDF list here as well. hope that helps any Qs, plz LMK
I am suggesting you to create a list of social bookmarking sites and one by one, open that and follow the instructions and fill carefully.... e.t.c
Of you can use the ShareThis button and tools : http://www.sharethis.com/ which works great for most sites.
I use social bookmarking and if you find the right sites, they have a lot of weight to your backlinks.
yup,social marks are more effective.Submission to blog directory takes a long time to get approval.You should be patient about this.