My mum got into the habit of sitting down just after the new year, sorting through all the collected stuff, & either selling it online (Craig's list, Ebay, etc), giving it away to charity (thrift stores, church donation boxes, etc), or outright chucking it in the bin.
Anything she hasn't seen/used since the last sorting automaticly gets added to the "Gotta go" pile; anything used less than a dozen times (1x/month) gets added to the "probably gone" pile; and anything used more than 1x/month is removed from the collection & moved to someplace it'll be more conveniently located.
The upshot of this is that the collection is kept manageable, the hoarding tendancies of my dad (RIP) were kept from driving her to murder him in his sleep, & it's given me the impetus to do likewise.
Now I sit down just after the new year among my own collection & start sorting into the same three catagories.
Everything that gets kicked out the door gets sent to charity rather than sold, meticulously listed for tax purposes, & written off said taxes come time to hand said paperwork over to my local taxman.
I can claim fair market value for everything I donate, which is invariably far more than I could have sold it for otherwise, & get a fat refund cheque back shortly afterwards when the taxmen realize I've just donated a small fortune.
"Did you *really* donate nearly 5K worth- what's this? Ah, the receipt from the charity to whom you made the donation... Itemized. In alphabetical order. Counter signed by the charity. *Sigh* Fine. Approved. Expect your cheque in two to three weeks..."
So all that crap I will probably never use ends up making me money rather than occupying what little storeage space I have left down in my cave.
*Does an arms outstretched, tripping the light fantastic, dancing twirl in the middle of the room*
Free! Free! I'm free of all the crap!
Frog pills. Definitely time for my frog pills...