I've been working on AFD and Approach Plates for my PRS-505. Mostly so I don't need to carry a paper AFD, and as a backup for my tablet which contains my 'real' approach plates.
Here's some photos of them on the 505:
http://www.wormley.com/gallery/v/flying/chartblob/
And here's the site with the downloads, for this cycle I did both PDF and EPUB, but for the reader I think I'm just going to standardize on EPUB, it seems a bit faster and requires less processing for me to create:
http://www.chartblob.com/