I have nearly everything in terms of brochures and Sales Literature from most of the manufacturers (diesel, not steam). Washington Iron Works of course got thier start with steam, way way back, and I am leaving the steam gear to the steam experts. What I collect is diesel.
I also have a bunch of Madill sales/promotional videos for the 044, 071, 009, 046 yarders and 075 line loder which I had put nicely together on a DVD by a production and film company. Turned out great!
My plan is to put all of the PDF color sales literature from each manufacturer on a CD for each- Madill, Skagit, etc. I'll sell them when finished for a reasonable price- $ 10.00 each or something. The scanning, etc is taking a crazy amount of time!
We have also looked at having a website hosted with all this on it (pictures, brochures, everything) and that could still happen someday.