I'm a designer and a computer power user. And while I feel that, functionally, jv16 Power Tools 2006 reigns supreme; it somehow lacks a touch of friendliness, usability and intuitiveness.
So, any plans to redesign the UI? My plan is to somehow categorize the many icons into manageable groups, or simply making the icon more descriptive of the tools by revamping its color scheme. I'll also propose the basic UI to comply with Windows native standard (no transparencies, standard window/menu size and so on) so it feels professional and integrated with other applications
Here's a great resource that I use all the time:
http://www.usernomics.com/news/user-interface-design-news.html
http://www.user-interface.org/
And the Windows XP Icon Guidelines, if you're ever interested in (explore around the site to find the general UI design guidelines.:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnwxp/html/winxpicons.asp