There's a principle in psychology that says promising something and then taking it away is a bigger disappointment than not knowing about it in the first place. Vaporware is the epitome of this for gadgetheads.
This Gear Diary diary on the Keyport brought back feelings of anger and frustration. If you don't remember, the Keyport was a device that took in six of your keys—custom made—and allowed you to individually *snickt* them out like a switchblade or Swiss Army Knife. Fantastic idea; shit execution.