John Resig:
The vast majority of web developers have never filed a bug report with a browser vendor — or even used a nightly version of a browser — which is a shame. If you think about it there are few who are more qualified to assess what is going wrong in a browser than those who spend every day developing for them.
I’m especially surprised when I see professional developers not filing bugs with browsers, or testing on nightlies. Since one of the primary tasks of most developers is to paper over cross-browser issues it becomes in their best interest to see the number of bugs reduced (and making their job dramatically simpler).
An excellent resource for every web developer who cares about having a healthy web and making his own job a little easier.