For those of you that haven't heard of it, the X3 chip is a revolutionary new sensor for digital cameras - rather than each sensor being able to "read" one color, each one can read all three colors (rgb), so you get effectively higher resolution AND much more accurate color, without a lot of the artifacts you get from ccd sensors. End result: pictures look a hell of a lot better.
Anyways, the Sigma SD-9 is due out this month (!) and for only $1800 - expensive, sure, but it's also the first of its kind and could potentially produce better images than high-end professional digital cameras (i.e. in the $4500+ range). Obviously, if it does well, they'll be able to scale it down for consumer-level models at some point, hopefully sooner rather than later. :)
A few links to whet your appetites: