Grandfather Left Me A Stamp Collection!

My grandfather passed away several years ago and left me a big jumbled box of stamps that I'm just now getting around to sorting out. Some of them are organized and filed, but many of them are stuffed in envelopes or scrap books. There also appears to be a $5 confederate note in the mix. There's also some interesting-looking stuff from Germany in the 1930s. I have absolutely no idea what all this stuff stuffed into my closet is. Is any of it valuable, rare, interesting, or otherwise noteworthy?
Here's a link to a gallery with a bunch of pictures I took.

Edited - having trouble posting a link to imgur.

*** Edited by Staff - You're having trouble posting the link because it's not allowed which it clearly said. That site is downright nasty and not allowed here. Sorry.***

A quick peruse through and it all looks pretty common to me. The US material is mostly post 1930's so value would be minimal. It would be a good thing to build on though.

This appears to be another of those "Modern Postage Stamp" albums that were being discussed in another thread.