Has this Browser Appliance been updated since the
initial release?
No, I haven't done any subsequent releases of the Browser Appliance VM beyond BAVM 1.0.0 (Dec 12, 2005).
I am working with several folks internally to flesh out both the future release schedules, and documentation on maintenance of the 1.0.0 release for those who have already performed some customization and wish to continue using it.
If not, is there any way of updating Firefox to the
latest version? - I've read somewhere that it takes
more than just doing the normal Firefox update.
Yes, but it takes a bit of fiddly-work because Firefox 1.5.0 went GA (General Availability) about the same time as the BAVM 1.0.0 did, and there was no Ubuntu 5.10 package for it. The mainstream Ubuntu 5.10 feeds remained on Firefox 1.0.x, Ubuntu 6.06 on the other hand debuted with Firefox 1.5.0.x.
I happen to have documented the latter part of the process (adjusting the default-spawned browser) earlier this evening for someone else, see this thread:
http://www.vmware.com/community/message.jspa?messageID=430636
Earlier in the thread there is mention of how to upgrade from Firefox 1.5.0 GA to 1.5.0.4 (current release) using the inbuilt Firefox upgrader engine.