Got something you think someone would want and planning to donate it to charity? Try the Friday night curb test:
– as soon as you get home from work Friday night, neatly set the item out by itself on the curb with a sign on it saying "FREE".
– if you live in New York City, take a picture of it (e.g. with your mobile phone) and mail it to street at garbagescout dot com. It will appear in a nice mashup map of interesting curbside finds.
– check out the window periodically and see if it's gone; if so, throw away the discarded sign. Voila!
– if it's still there by midday Saturday, then take it away and donate it to charity.
Note: curbside sharing not recommended during rainstorms or blizzards and don't put out whole boxes of stuff which get pawed through and scattered around the area making your neighbors hate you. This is best for the discrete item, e.g. "dresser", "1960's stereo", "big stewpot", "pair of shoes". Visit Garbage Scout for good examples.
Learn other methods of sharing at Freecycle.org.