I'm a little late to the party on the discussion of what to use as a reader for 10-Ks and 10-Qs, but my favorite method is to combined dropbox on my Mac (works on PC as well) with an iPad and the free dropbox app.
Essentially, dropbox creates a folder that syncs with a remote server, so you just create a folder for all your research documents on your computer. Every time you save something to that folder, the application automatically uploads it to the remote server. Then you just access the remote server via the dropbox app on your iPad.
Sadly, you can't add notes on the iPad, but it certainly saves on printing reams and reams of annual and quarterly filings.
(link to get a dropbox account below)
https://www.dropbox.com/referrals/NTc2MTQ4OTc5?src=global0