Requires Pixelpost 1.5 I made a WYSIWYG editor for PP out of tiny mce. If you don't like this addon but you like to have a WYSIWYG check out this FireFox extention...
This admin addon enables you to add watermarks to your images. The defaults can be set under Options/Watermark, and individual settings can be tuned in the New Image and Images/Edit Post menus...