Amy, That's a good thought and would have been an option if Phill had not reinstalled windows. There is a slim chance that putting Windows back on the drive did not do a full format, and only erased the directory (quick format). Then the files would still be on the drive, but the locations would be lost and some data could theoretically be recovered forensically. That however is time consuming and frightfully expensive... you send off the drive and it is dismantled down to the "spinning rust" and examined bit by bit.
The other scenario I was expecting was that the drive would not boot. In which case you could pull it out and dock it. boot the system from an external drive and OS, read the directory and extract the files you wanted to save to other media and move it back afterwards. Even a failing drive can usually be persuaded to give things back with patience in this manner.
Phill, as for your portable drive... don't format that puppy yet! Like Amy suggested, most of your stuff MAY still be on there in one of the older backups. search it for the most recent backup you have and browse through that. Depending on it's age, the bulk of your data may be resident and that stuff you can surely get back!
Good Luck;
Doug
"what is this quintessence of dust?" - Shakespeare