Recently I upgraded my browsers at work. I've now got Firefox 0.9, Mozilla 1.7, Opera 7.51 and some IE thing. I only use IE to test things, it's pants to develop on, and I only use it because it's "company standard".
My favourite toy has to be the Web Developer Extension for Mozilla/Firefox. Very cool, it allows you to do lots of things that are normally a pain during development: turn things on and off on the fly, clear authentications, view xhtml block elements, and edit the style sheet on the fly. Opera isn't quite as powerful, but even that has it's debugging and developing tools.
At the moment I'm working on a SAP application server that uses TT2. I've got the Badger book, and I'm slogging my way through TT. I know our HTML guy coudn't grok TT, he hated it and to be honest I can see why. While I like some aspects of TT, and it does seem to work, I don't belive many of the claims made by the fan base. Templates aside, if it all goes well, I've offered
brian d foy and article on the experience.