I have developed php web scripts to take raw data from a database or flat file and transform them into Amazons upload protocol, for insertion directly into Amazon.

With this web script you never have to type listings into Amazon directly again, they get directly imported.  

I use this app usually weekly for our own production stores and you will press a button and all your products are inserted into a flat file which you directly upload into Amazon, saves SOOOOOooooo much time.

Call for details.