I just joined tonight (though I used the site years ago and enjoyed it very much then) and am finding it a bit cumbersome trying to get the lessons onto my iPhone. I drive a truck for a living and like to listen to the lessons during my long drives, so I'm loading up the lesson, review and dialog MP3s.
It'd be nice to have an option to download a zip or rar file so I don't have to go to each lesson and download each file individually. I'm skipping the PDF files because I probably won't look at them while at work, but they'd be nice to have on the phone anyway.
This would be 100% better if there was an option to download directly to the phone, say through the iPhone's podcast app or a Jpod app with access to all the lesson materials. Maybe something like Spotify's "Available Offline" option.
I'm sure y'all have thought of this and I know implementing things like thess aren't as easy as some may think, but just putting it out there.