Review on Narrow Picture Hanging Strips, White, 12-Pairs, Convenient Easy-Open Packaging for Improved Online Visibility by Chris Moody

These things are awesome. Installing them will require a little more work than just pounding a nail into a wall, but if you take your time and follow the instructions, they'll work great and save your walls from Swiss cheese. I used it to hang pictures and magnetic boards that each weigh several kilos and are still hanging on the wall months later. If you change your mind and want to move something, you can remove it by simply pulling the bottom tab. I haven't used them for anything heavy so can't comment on that, but they work great for hanging a regular painting on the wall. Try them and I'm sure you'll love them as much as I do!