I've been using WINSCP for a year or so now and think its great. :D
I'm not sure if this has been requested before but I would like to request an image preview tool.
I don't mean anything supremely powerful with image editing tools or anything like that, just something along the lines of the picture viewer that's built into Windows XP that supports all of the popular image formats (.jpg .gif .png .tiff etc).
I think it would be nice to be able to double click on an image and view it rather than see it's code.