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Amazon (s AMZN) is now allowing publishers to add “Send to Kindle” buttons to their websites and WordPress blogs, the company announced on the Kindle blog Tuesday. It can be integrated into WordPress blogs as well. The Washington Post, Time magazine and the blog Boing Boing are already using the button.

Amazon presents “Send to Kindle” as an alternative to read-it-later services like Pocket and Instapaper:

“The Send to Kindle Button lets you easily send that content to your Kindle to read later, at your convenience. Just send once and read everywhere on any of your Kindle devices or free Kindle reading apps for iPhone, iPad and Android phones or tablets. No more hunting around for that website or blog that caught your eye — just open your Kindle and all the content you sent is right there. The Send to Kindle Button is also great for those who want to collect content from the web to use in work projects, school assignments, or hobbies.”

The new feature for websites is the most recent in a line of read-it-later services Amazon has launched. Last year, the company announced a “Send to Kindle” button for Google (s GOOG) Chrome, and later added support for Firefox. And users can already email files to their Kindles or transmit them using desktop apps. But the browser extensions — and now the web app for publishers — are Amazon’s effort to make the Kindle and Kindle apps an easy way to read all types of content, not just ebooks.

Developers who want to add the button can do so here, and the WordPress plugin is here.