Back from the Mozilla powwow -- check out the Netscape evangelism site for an array of tools compatible with Mozilla. A sniffer, tree widget, and some unique CSS references.
Regular visitors may have tried my DHMTL implementation of piemenus. It's been done more robustly by the originator at piemenu.com. The good: robust, stylable, multiple linked instances, and large item capability. The bad: ActiveX, fixed number of elements in first level cirlce. The beautiful: open liscensing. Maybe I'll eventually get around to using the dynAPI to make my version cross browser -- there are some interesting implementation decisions in the ActiveX version.