I wouldn't donate to Planet Aid if you really want your donations to be of use. They're a super shady organization: http://losangeles.cbslocal.com/2011/12/06/charity-watchdog-accuses-planet-aid-of-misleading-its-donors/ I really like Second Chances in Somerville. I brought stuff to a drive a few months ago and they seemed really on top of things. Also, they're local, if you care about that sort of thing.