Hi all!
I save all of my envelopes too. {thumb2} Obviously, I have many on which the celebrity wrote (Zac Efron, Rob Pattinson, Ben Barnes, etc.) and I would never throw them away!

Also, just today I had to go through them to check the postmarks out - it's a big factor when wondering whether an autograph is authentic or not (I wrote the names whose autograph I got in pencil on the envelopes). {thumb2} Also, so far I only have 27 autographs so it's not like I have my room full of envlopes!
I keep all of my signed photos in a plastic file - they're very safe there and it's the only item on my desk so whenever someone walks into my room, they immedaitely browse through my file!

It has a very nice front page too, which I made.
Thanks,
zanne