I was able to locate and download about 98% of my forum contributions (threads I started, threads I contributed to) using the following method search string on Google:
bwv site:http://ubercart.org/forum/support
Once I got the results (only about 50 in all), I clicked on the cached pages, and saved each one (as a single .html page) to my hard drive. The whole process took about 20 minutes. I then zipped them and made them available to UC management.
If all of us "old-timers" do the same we should be able to help UC get its content back in some usable form. Seems to me its the least we could do to help out in this emergency. 