Add the Keep It button to your bookmarks or drag and drop it to your bookmarks toolbar.
Whenever you want to keep a page, press the Keep It-bookmark from your list of bookmarks to open a save-popup to keep the currently visible page.
Just Keep It
This bookmarklet is using cookies coming from a different (our) server than the page you would like to keep. For use of Internet Explorer it is required to lower the security settings so that signed in user can be determined.
Below is a description how to change the settings.