It has been interesting to watch the 1Password icon popup in the strangest places on the Internet. So far 1Password has not been as "privileged" to have its icon ripped off as many times as Panic's Transmit has been, but we might catch up as people are finding creative ways to (illegally) use the 1Password icon.
Dave Batton from Mere Mortal Software dropped me a note showing that 1Password's icon is being used on Erico Motorsports website as an icon for their Scooters (I'm purposely not linking as they don't deserve the extra Google juice).
See if you can spot it:

While imitation is the best form of flattery, it drives me nuts that we now need to have a lawyer send these guys a Nastygram in order to preserve our property rights. I would be happy ignoring them, but then someone else could use our inaction as an argument against us in a future infringement dispute. Sigh. I guess this is why the lawyers end up getting all the money.
The only good news is these guys at least had the decency to steal the entire icon and not mess with it too much. They could have done much worse and turned it a putrid green color like this impostor did:

Like TUAW said, the 1Password icon shows up in the strangest places.