Mikhail Grushinskiy has released XMLStarlet 1.0.1, a command line utility for Linux that exposes a lot of the functionality in libxml and libxslt including validation, pretty printing, and canonicalization. This release fixes some bugs and has been recompiled against libxml2 2.6.18 and libxslt 1.1.13.
The Mozilla Project has released Mozilla 1.7.6. This release fixes assorted bugs including several security issues.
Thunderbird 1.0.2 has also been released.
I've been using Mozilla 1.7.x for a while now, but yesterday after increasing problems with crashes, especially in Mail, I switched over to Firefox and Thunderbird. Mozilla still has a few features Firefox doesn't. Most
notably a forms tool that can save and refill forms, something I find very useful for conference submissions. However, over all Firefox/Thunderbird seems to be more stable than full Mozilla, at least prior to today's update. It definitely has a prettier interface.