Drosera looks like it has a lot of potential, but I haven't worked out how to do anything useful with it yet. Documentation is sorely needed.
Here is a good example of documentation for Venkman. http://www.svendtofte.com/code/learning_venkman/
Drosera no longer exists and a debugger has been added to the Web Inspector. We should keep this bug about adding documentation for the Web Inspector.
This is the best documentation I've seen on how to use it from a user perspective: http://webkit.org/blog/197/web-inspector-redesign/ The documentation that the webkit.org/blog/ links to... very vague: http://trac.webkit.org/wiki/Web%20Inspector This mentions some of the lower level items, but it says "proposed" and might not be what finally resulted (closest thing to a developer's interest): http://trac.webkit.org/wiki/ProposedWebInspectorRearchitecting I would like something more substantial.
There is now also: http://developer.apple.com/safari/library/documentation/AppleApplications/Conceptual/Safari_Developer_Guide/UsingtheWebInspector/chapter_3_section_1.html
Awesome Tim. Thats much more official for the usability aspect.