Maybe I was just way out of the loop on this one, perhaps you've all been using these for years, but I just discovered them and had to pass it on.I've been using the 3M command adhesive hooks forever and found them very useful. So, when I happened upon these picture hangers based on the same 'easy-remove' technology, I had to give them a shot. By the way, I found them near the hooks in the Wal-Mart hardware department. I believe they were around $3 for 3 hangers.
I couldn't believe how easy they were! I'm horrible at hanging pictures. I hate all the measuring and leveling. I also have a newly painted house and dreaded putting holes in all the walls. These handy little velcro hooks provided a great solution. Essentially, they work like the hooks. Whenever you decided you want to remove the hanger (off the back of your picture or off the wall) you simply pull down on the hanging tab and it pops right off. The two velcro strips can separate without pulling the strip off the wall, so it's really easy to pull all your pictures off for cleaning and then put them right back on.
When I created this arrangement, I laid them out on the floor and figured out how I would want them to look on the wall. Then, I took a picture of the floor arrangement with my digital camera. After that, I stuck both pieces of the velcro hangers on the backs of all of the frames. I then placed the frames on the wall (starting from the center and working out) by referencing the thumbnail-size picture on my camera. In less than 10 mintues, I had a cute, well spaced arrangement on my wall and I didn't use a nail, measuring tape or level. Better yet, when I get sick of it or when I need to add new pictures, I can easily rearrange the pictures without any damage to my wall. Just thought I'd pass it on. 
