DVConverter is the software-only solution for converting between NTSC and PAL format DV files. With powerful features like batch processing and colour balance correction, this is the ideal tool for converting large quantities of video. Processing is done at the field level, resizing the frames using high quality algorithms to maintain image sharpness.
I know a few of the forums users have need this solution in the past. You can download a trial from the PureMotion website:

http://www.puremotion.co.uk/dvconverter/index.htm