Dry Erase Clapper Slate for $8
Here's a very useful tool that I was forced to rebuild when my last one was damaged in a production. Essentially a laminated card slapped onto a clapper slate, this can come in very handy when identifying your footage in post. I blogged about this in the past, but when those old links died, I decided to take matters into my own hands--literally!
If you would like to make your own clapper board based on the graphics shown in the above video, I've made them available for download.