Flex - Silverlight - Laszlo- Javascript - Widget IDE: Spket

This IDE looks promising. It supports JavaScript, XUL/XBL, Laszlo, Flex, SVG, Silverlight, and Yahoo Widget intellisense. Take a gander here-

http://www.spket.com/

Free for personal use, under 30 for professional. If you have used it please leave a comment and let me know what you think.