It's hard for me to throw anything a way, so personally I'd probably keep it, file it, just-in-case I needed it later. That said, my husband HATES clutter and forces me to go through my "keep files" once or two before filing and each time I am usually able to cut the stack in half. Same with clothes - if I haven't worn something in over a year (or two or three), why do I keep it? He's constantly "thinning" my closet!
Oh, and I've been able to suffer through it by telling myself I can always buy something new! Better! Improved!