For me, the bigger part of the clutter battle is getting it out of my HOUSE! I don't know where you donate your clothes, but the place that I take my clothes to also takes household goods (kitchen gadget,s decorating items, ect.) basically anything it can sell. Lately I have been taking to the local women's shelter (kids clothes, toys, maternity things, ect.). If I have household goods, I box them up and take to the other place (an hour away, so I save this stuff up). IT is affiliated w/ the local hospital, and the $$ all goes to cancer research, so it's all good
Books and movies all go to the local library (mine SUCKS! I think they could do good w/ any donations they can get!)
As for not throwing stuff away that is still usable, I have this problem, too. Esecially w/ stained kids clothes :P I think in my head "Well, I can still use them on my kids b/c thy are just here at home, play outside, ect., " but I will not give them away b/c I don't think anyone else would put them on their kids. I do have one local lady that I know who is raising her granddaugher, who is a year younger than my oldest, and I know she doens't mind stained stuff, so I give that to her
: I also give her nice stuff, too!