Ask yourself: does it work? For me, the items that don't work will be the first to go. If you've owned it for years, it no longer works OR is no longer compatible with newer gear - chuck it.
Don't buy any new storage. This means no new under-bed storage boxes or decorative wicker baskets. If you don't have anywhere to put it, you won't keep it. We're all guilty of filling up a drawer, shelf or closet until it is a total wasteland of useless stuff, so don't bring in new storage containers. Clean up the problem zones and neatly organize the things you do regularly use in those places.
Try a different kind of "trial period." If you have a camera lens, hard drive, card reader or some other tool you like, but you haven't used in over a year, put it on a trial period. Then, place it in a high visibility spot where you will be forced to look at it everyday. If you go 6 months without using it when it's in plain site, you probably won't use it at all.
What are some of your tips for keeping old tech from dying and taking up space in your office?
(Image: Elizabeth Giorgi and Gary Barber via Flickr's Creative Commons)