The feature can be very similar to the already implemented "watermark".
only adding a blank Box (choosable backgrond colour) to the bottom of the pic.
width like the pic, height depending on the content
A choosable external logo path (jpg / gif) (Position right, left, bottom)
And for the text the same freetext, variables + selectable fontsize, fontface, fontcolour as on "watermark"
...but some nice arranged templates are always welcome of course
OK. Here is what I could see doing:
You get to choose a logo file (Has to be one of the image types we already support). The height of the text box will be at least the height of the logo but can be taller (you can specify the height in pixels). If you want additional dynamic text, then the logo can be on the left or right side, and the text will use the opposite side. The width of the dynamic text area will be the width of the output image minus the width of the logo. Background color will be selectable. Text color and font will be selectable. Font size will be selectable, though if the dynamic text when rendered would exceed the bounds of the dynamic text area then the font size would be reduced down until it fit or it hit a minimum font size like 8 pt.
I'd guess you all would want this to be available in all of the various output dialogs: Save as, Send Photos as Email, FTP As, Upload to PhotoShelter, HTML Export, but not in the Printing of proofs or contact sheets, right?
To make this as straight-forward as possible I would want image scaling/cropping/sizing to ignore this tacked-on text block. So if you wanted a 1200x800 pixel image and then you added a 200 pixel text block, then the resulting image would be 1200x1000 pixels.
How does that sound? And you want it yesterday, right?
-Kirk