In trying to roll out the new Firefox 0.8 to our student sites, I went searching for an unattended install method. Most modern apps support this, and it makes how we distribute applications MUCH easier. Hell, even GAIM and the windows port of the GTK support this.
There does appear to be rudimentary support for unattended installs, once you grab the exploded archive out of the temp directory (this is common practice). Flip a couple strings in the well commented CONFIG.INI file, and should be ready to go. NOT! It still pops a dialog asking where you want to install to. So much for unattended. There is a bug report about it, maybe it will get fixed.