Firefox: The new release candidate Firefox 3 RC2 is out. No date yet on the official launch, but they’re still saying June. Also, developers are starting to talk work that’s gone into what will become Firefox 3.1, such as completing CSS3 selectors support.
Internet Explorer: IE8 beta 2 is scheduled for August. I’m looking forward to seeing what they’ve done, and figure I’ll start updating sites to accommodate changes. I held off changing too much when IE8b1 came out, because some of the differences were obviously bugs (triggering the Caio Hack, for instance; and yes, I reported it).
Flock has been moving ahead with small, rapid releases, adding integration for new services each time. They just added Digg and Pownce in Flock 1.2 a few days ago. Now they’re getting ready to start on Flock 2.0, which will merge in all the new capabilities of Firefox 3. That means it’ll get new rendering capabilities, better memory management, probably EV certs and such.