I decided to integrate other push services as well and moved development to github. The new tool is called pushmenu and supports prowl, notifo and boxcar.

A Mac OS menu bar application (see below) for sending push notifications to an iPhone using the Prowl API. It can be used to send URLs, addresses, phone numbers, or any text information, either directly from the clipboard or via the services menu. Works in any Mac OS application. Requires the Prowl app on the iPhone and an account at the Prowl website.

Requires Mac OS X 10.6 (Snow Leopard)

Use Automator to pass any kind of text information to prowlmenu: