I'm curious to know what you guys do with your signed booklets. Do you remove the regular booklet from the jewel case and insert the signed one in there, or do you have a "stash" where you keep all your signed booklets?
I stick the signed ones inside to keep them nice. I put the regular booklet right on top in the stack so it also stays relatively nice. Of course before putting them in the stack I scan the full regular booklet and the front of the signed one.
I only have a couple. For signed inserts that are also booklets, I put them in the case and stash the unsigned one somewhere else. For ones that are just a single sheet insert (like Batman: The Animated Series - Volume 2), I put the signed one in front of the unsigned one.
I've got quite a few signed covers (50+) and most of them are housed in the CD cases with their respective CDs. Some of them are doubled up - like when LLL sends you the separate, second cover thats signed, if I can find a jewel case that has only one cover in it already, you can usually sneak a second one in behind that.
However, the case I've put them all in is now too small so I'm trying to figure out new storage that keeps them out of direct sunlight and away from moisture (I had been using an old wooden "wine humidor" the the last ten years and its great but, again, its gotten to be too small.)
I had my covers displayed on a wall using plastic sleeves but had to take them down to paint that wall. So for the time being they are stored in sealed plastic sleeves. I'm not sure wether to put them back up or maybe look for a storage folder of some kind.