Safari Extension: Procrastinate -- toolbar for reading and bookmarking services

This extension provides a toolbar and context menu for instapaper and readitlater.

You can get functionality like this that doesn't take as much browser space, but this one's got some unique features:

• Submit multiple pages simultaneously: if the service supports it, Procrastinate will allow you to sumbit all tabs in the current Safari window.
• Configurable toolbar: services can be dis/enabled and rearranged as needed. Users also have the choice between a grouped toolbar or an expanded toolbar (which offers 1-click access).
• Requests are asynchronously in the background: Procrastinate will never block Safari as it issues requests to a service.
• Each service has its own icon in the toolbar; clicking it will take you to the site’s homepage.
• Procrastinate also features context menu items for each of the services you enabled.