Yes, but only bundled with other similar adapters and a cable... This makes it more expensive than a iRiver-like cable, although more portable, too.
But then, depending on what you want to plug onto your Zaurus, such a cable-less adapter might make the whole assembly not very practical to use!
Check
this post for a picture of my current USB setup (I've got a iRiver-like cable, too, not on the picture, though...)