Hi - is it that you are saving for stock images that have a minimum file size acceptable ? If so use Rawshooter as per Simon's post. On the Batch Convert tag click 'More Options' then change the save type to 16bit Tiff. This will give you a very large file size. The biggest drawback is you will not be able to do adjustment layers with PS7 so you will need to make duplicate layers and adjust and blend those. If you have PS CS you can do adjustment layers as it has full 16bit support.

And every one said, 'If we only live,
We too will go to sea in a Sieve,---
To the hills of the Chankly Bore!'
Far and few, far and few, Are the lands where the Jumblies live;
Their heads are green, and their hands are blue, And they went to sea in a Sieve.

Edward Lear
http://www.nonsenselit.org/Lear/ns/jumblies.html