The idea behind this plug-in is that it allows users to pick colors in three dimensions. The chosen colors can be fine-tuned using joysticks and sliders. Once colors are added to a palette, those palettes can be saved and shared with others. If you want to see how it works, check out the tour of Colorotate. There is also a page on their site that gives you a lot of background about color (this isn't specific to Photoshop at all).
The Photoshop plug-in costs $39 and like I said, it will only work in Photoshop CS4. So I'm curious to know if any of you would find it useful to have something similar for use in CorelDRAW and Corel PHOTO-PAINT. And for those who would find it useful, would you spend $39 for it? If there is enough interest, I'll pass along your feedback to the developer and see if they would consider creating a version for CorelDRAW users. Of course if you aren't interested, no need to say anything. So post a comment and let everyone know how you feel. For those who haven't posted a comment, there is a link at the bottom of the post for doing so. Please don't reply via e-mail as I'm the only one who can see it.