Amazon.com : 2pcs Office Desk Accessories Monitor Memo Board Computer Message Board Office Supplies for Women Men Computer Sticky Note Holder Home Desktop Message Office Decor (Smooth Monitor Memo Board) : Office Products

It's a pair of rectangular, clear plastic pieces with double-sided tape applied to the side. While the surface itself is not dry-erase board, it offers plenty of clean space to add temporary sticky notes. I have four external monitors on my desk which are often cluttered with random sticky notes, and the desk surface itself is almost always covered with all sorts of documents, devices, and other notes. I like the brilliantly simple but practical idea of utilizing the unused vertical space of screen bezels.The double-sided tape is about half-inch wide, and thus it requires at least that much of bezel around the monitor. If using a monitor with super thin rims, it may not work for you.