I second the washing basket - I throw random things in and put them away when I have 5 seconds... Although sometimes it takes a few days!
Another thread a while ago suggested you leave a basket in each room for a week and add things to it you don't actually use or take up space and cause clutter. At the end of the week be strong and throw the contents out. I did that and got rid of silly things on my bookshelf & random toys that were broken, not part of anything... I felt good! Looking around now I may need to do this again.