Arduino+Barcode scanner+Ethernet shield

Hey there everyone Im looking to see if this project is feasable, or if i should look at another way of doing it. I have -Arduino Ethernet Shield -Arduino Duemilanove -USB Host Shield -USB barcode reader

I am looking to scan items and upload them to a database. Idealy scanning items in and out so i can keep and inventory of what I have. I have seen that is Arduino cannot function with the USB reader but with some hacking one with a PS/2 connection could be used. Any insight would help me out. Where can i find more information, what sort of database should i use. Anything at all would help.

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