There may be a few here that collect memorabilia and flown items from various space programs. Of course there are the typical patches, pins, autographs and models and many sites in existence that cover this realm more extensively.
I collect space flown and flown type items. (The type you see floating about the cabin on a shuttle mission, for instance) A few favorites are grouped below. They include the Grid 1530 Laptop, STS-27 Orbit Operations Checklist, and the HP-41CV calculator. (All in use in 1988) The Gold clip on the checklist is directly from the manufacturer. The timer and clip flew by the dozens on just about every shuttle mission there was and are still used on the ISS today. The Swiss Army Knife (off to the right) is a limited edition produced for NASA with a small batch made for the public and is now discontinued.