* A widget-enabled theme. - Check
* WordPress 3.0.1 - Check
* jQuery 1.5.8 - Version 1.5.8 Does not currently exist. WTF!
This is the third plugin I have tried. It offers the most promise once the bugs are worked out (or the now catches up to the future where jQuery current release is v1.5.8, not the actual current release of v1.4.2.
Sorry, try again.