From the site:
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Publishers in the United States, Canada, the UK and Australia are using NetGalley to interact with our growing community of professional readers, and to invite their own contacts to view their titles using the NetGalley widget. Ask us about security options for protecting your content, how to market to our community, and how to use the widget to provide direct, pre-approved access to your titles. We provide prompt, friendly technical support for you and your contacts, and best practices for using digital titles in your marketing and publicity campaigns.
There is no charge for professional readers to use the service; publishers pay a set-up fee plus a monthly cost depending on the number of titles you have on the site. We also have an option for publishers and authors who are interested in listing a single title. Finally, there are many ways to connect with the NetGalley reader community through our Marketing Programs. Please fill out this form.