This is an initial stand-alone script that shows you the progress of your downloads.
What it essentially does, is go through all task names, and find if there is a task with a name including "Downloads" and a certain percentage. This might be a bit hackish, but it works at least for me.

Furthermore, I think that the code I'm using to find out names for tasks is very re-usable (I also used it in my Quod Libet stand-alone script), and may be good to include this code in AWN itself, so everyone providing a plug-in can just call AWN and ask what windows there are open. That would be nice :)

Okay, enjoy, I hope it works for you too..

Here you can find a video of the plug-in in action: Download Here

EDIT: It seems that if you set the sleep period too short, it crashes AWN with a segmentation fault.. Maybe someone has a reason for this?

EDIT2: I updated the plug-in, so it removes the progress-circle when the download is finished.