There are a large number of email marketing and advertisement producing sources in the Internet. In order to play the efficiency of email marketing, we have sorted a link list out:

MarketingSherpa.com
There are a large number of email marketing cases and studies in this website, you can subscribe their newsletters.

Clickz.com
This website is about the latest news of email marketing and online marketing.

MarketingProfs.com
There are many articles and cases in this website, you can register as a member to browse all the email marketing and online marketing articles for free.

BtoBOnline.com
B2B Email Marketing Guide in this website is worth reading, such as search engine promotion, direct promotion and email promotion.
http://www.btobonline.com/section/b2b_email_marketing_guide

GrokDotCom.com
There are many articles about marketing promotion in its blog, this website is famous for boosting Conversion Rate.

MarketingExperiments.com
There are many great marketing promotion experiments and cases in this website.`

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