tool/feature (re)commendation

For the last few days, I have (finally!) been using Mozilla (the stable 1.2.1, since I wanted a stable version running and wasn't in a position to be an alpha tester for 1.3a). This is clearly a cool browser for web developers what with its extremely helpful JavaScript Console and ... sound the trumpets !... DOM Inspector. The latter constructs a DOM tree (in simple words: a tree representation of the different HTML elements in a web page) and highlights the area in the webpage as you step through the tree. A great aid if you are (still!) writing web page crawlers and scrapers.