There are plenty of products you can buy to hang your keys on the wall for easy access, but none with the geeky charm and stability of plugging them in to an RJ-45 port. With a few cables and a cheap panel, you can make the most uniquely awesome keychain and key holder combo on the block.
How to actually do this project should be pretty obvious just from looking at it, as it's Instructables user harari's idea that's particularly clever and not the assembly. Basically, you just cut off an RJ-45 cable and attach it to your key ring, then mount a few ports to your wall. Plug the severed cable into the port and your keys will hang from it securely. Very cool.
RJ-45 Key Chain and Rack [Instructables]