as of now, you can't download everything from one level.
but this feature will be available in the near future. in fact, what we will have eventually is a customizable RSS 2.0 feed. you can choose a level and choose which media you want (for example only dialog tracks, or only kanji close up pdf's).
currently, you can download the 10 most recent lessons of any specific level.
this is how it works:
go here:
http://www.japanesepod101.com/index.php
down on the right sidebar you will see a section called "RSS 2.0 Feeds"
there's a dropdown there. for example, choose "Newbie Lessons" from the dropdown.
You will be redirected to the Newbie Lessons public feed which contains the last 10 main audio files.
open up iTunes. go to "Advanced --> Subscribe to Podcast" from the top menu.
paste in the URL for the Newbile Lesson Level feed (
http://www.japanesepod101.com/category/ ... sons/feed/) and done!
currently, the closest thing we have.
but soon you will be able to customize to exactly what YOU want and download it all instantly. i'll keep you (and everyone) posted!
marky