Below is a quick demo video of the new multitasking feature that will be available with the 4.0 firmware.
Multiflow is a multitasking application. The app uses Backgrounder to start applications running in the background and then allows you to view and switch between the apps that are running in the background. It basically puts a GUI on the Backgrounder utility. Check out the demo video below.
Steven Troughton-Smith, the developer of both Stack and Orbit, is now in the process of developing a new multi-tasking application. According to Troughton-Smith, the app basically adds a GUI to what the Backgrounder application already does. There is not a ton of info about the app however, he did post a screenshot and it looks pretty cool.