What a weird coincidence that I come across this video and article over at DPreview about Sigma's new WR Ceramic lens protectors just as I was looking for a new 77mm lens protector. These ceramic protectors can apparently withstand a ballbearing drop test like no other product on the market. The WR Ceramic protector is basically unscathed after having a 1.7oz ball dropped onto it from about 4 feet.
They come at a high price though. The 77mm version I would need is $118! Yikes! For now, I'll just enjoy the video and pretend I have one.