Thank you for responding, and for the excellent tool! I just stumbled across it yesterday and am already attempting to put it to good use.
I'm using it to augment the capabilities of ACDSee. I'm uploading images to Fotki while retaining the categorizing work I've done in ACDSee. From what I've seen so far, the performance is very good. I used exiftool on nearly 3000 images in subfolders and I think it only took around 5 minutes or so to accomplish what I needed. A tad faster than doing it manually. :)