Creating promotional literature from templates on the web

One of our clients is a manufacturer of industrial products.  HIS clients
are dealers and distributors of said products, and we have put together a
site to support them.

He has a (paper) kit of promotional literature templates which the
dealers/distributors can use to produce their own promotional literature,
customizing them with their own logos, copy, etc.  He would like to create a
web-based version of this kit, so that the dealers/distributors can, for
example, upload their logo, insert it into an ad template on the site, and
output the result as a PDF file (?) which can be printed by their client or
taken to a quick-printer.  (That's first step - eventually he wants to have
templates into which product photos can be selected from an image library,
etc., etc.)

Given these sketchy requirements, is anyone familiar with software or a
service provider which does something like this?  Windows NT/IIS platform is
preferred, but any suggestions are welcome.

TIA . .

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