Beneath my game design shelf is the shelf I least like, this one:
This is where I keep my backup storage, media to use for backup storage, and most of the installation CDs I have for non-game software.
Although some of the discs I have for backup storage is used from time to time (DVDs), some of it may as well be throw out (3.5 in floppies) and some of it I can't even read without cannibalising a drive from one of my old, dead PCs (5.25 inch floppies). I have empty CD cases, more floppy disc labels than I have ever written floppy discs, and stacks of writeable CDs that would be used for saving cassette tapes to if I didn't have an iPod now.
In terms of saved media, some of it is vaguely important for historical reasons (eg. MUD2 sources), assuming it's still readable. Most of it is interesting in terms of, "ah, yes, I remember that", but I'm not going to look at it ever again. Some of it served specific purposes that I have no need for any more, such as the disc I used to transfer programs from my Atari ST to and from my PC. Some date back to my Apricot F10, and to read them I'd probably have to dig the actual machine out of its retirement box in the attic and boot it up (if two decades of temperature fluctuations from freezing cold to baking heat haven't hurt it) (and I should have taken the timer battery out of it before putting it away, too).
The software I have includes old versions of viciously choking anti-virus software, MS Office CDs, manuals, fonts, some freebie stuff that seemed worth keeping when I put it there (encyclopoedia CDs, for example), and the CDs for some other random software packages I still use (or might use) such as screenwriting, D&D cartography and Windows 95 (hey, if I want to run Daggerfall I may need it!). I also have some manuals and, well, gawd knows what else.
The right-hand side of the shelf has three boxes of 3.5 inch floppies in it. Some of these floppies are cover discs off old magazines that I've never loaded even once. There are some old DOS office programs there (ah, Protext) and numerous incarnations of my first novel. There's MUD2 client software written by players, there's a ton of other stuff. However, let's just say that if the house caught fire it would be among the last of the contents I'd try to rescue.
The hook in the middle has useless CDs on it. It was full nearly to the top, but one of my daughters needed some unwanted CDs at
school once so I sent them along. It's unlikely that this is going to happen again, though, so they can probably go in the bin.
And that's the software shelf.
Gawd, I hope my wife doesn't read this or she'll make me clear it out...