The first one I remember is RealPlayer. I think the official story was that they were having more and more trouble convincing people to install upgrades (at a time when 56k and slower modems were still common, dowloading an app could take minutes, ugrade nags seemed to be ever present), so they decide to name the new major version RealOne Player "because it's the One, the only One you need, the One that does everything for you".

Of course, this meant that the next time they tried to get anybody to install a patch, some of us felt annoyed because. RealOne Player wasn't "the One" after all. Why should we get back on the treadmill of waiting for downloads that rarely seem necessary?

Ahem. I think this event sensitised me against all attempts at using "one" like that. I mentally flip a table every time.

one.copilot.net