IndyGopher said:*SIGH* yes, there is. Has been since the G4 iMac (Mini-VGA) and the later G3 iMacs (VGA)
The video out is mirrored (not spanned) but there are ways around that. Google it. Note that the video out requires an adapter to standard VGA, and you would then need yet another adapter to connect the DVI Apple monitor. Whether it is worth going through all that is another question entirely. Some third party mini-VGA to DVI adapters might exist, but I was unable to locate any in my exceedingly brief search.
The DVI cable actually carries both an analog and digital signal. You can just pick up an adaptor that 'converts' VGA to DVI for very cheap. I know all my graphics cards that I have bought for PCs over the years that have both a VGA and a DVI port have came with an adaptor.
I still think Apple should of put a VGA port on the monitor, considering it would of increased it's usefulness dramatically.