Hope you can recover it somehow Matt. I know the feeling, though I have been lucky lately and have become much better about backing up my important data regularly. Having an external USB 1TB hdd that I can move from one computer to another to make backups of each system has made it so much easier for me to keep up with a more-or-less regular schedule.
Now if some day I plug it into my Vista Ultimate computer and it screws up all of the partitions on the 1TB drive and I lose all of my backup data, I would be very upset too. (keeping fingers crossed)