A list of social bookmarking website is easily obtained. But you should always check that the social bookmarking websites are relevant and have enough pagerank. Some social bookmarking websites are totally useless. I would suggest you to try only the most popular for example: myspace, google, delicious, digg, stumble upon, .. around 10 social bookmarking websites are more than enough.
The Benefits of Social bookmarking blog is nice. I really appreciate that someone has written about it. This is something that marketers should look up and publish.
You do not have to type the title url and description over and over again you can use this socialmarket a list of social bookmarking sites http://www.socialmarker.com/