Retractable Sharpie ... Brilliant!
Definitely a new trick for an old dog. An even better trick: Put your corporate logo onto this well-known name brand; not bad being associated with utility, convenience, and now, longevity.
One of my favorite blogs, "book of joe", seems to have discovered this brilliant piece of engineering.
Never dry out your Sharpie again from losing the cap. Click retract like a regular pen.
And you thought all the best inventions had come and gone...