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Hi Thom, xISBN is a great service and all of the others you suggest would be fantastic. I would put in a plug for a SOAP layer, only because it is useful for wrapping services like this into non-web applications. Someone writing an application in VB or wxpython for example, can specify a WSDL file and get the plumbing put in place to use the service. This can be done with HTTP tools for the desktop as well, but WSDL support is getting very strong in this environment. I have also thought about a date range/sort type of option on xISBN, so if you are matching up something with a gazillion ISBNs, like "Mark Twain", you could try to slant the return set to get the most likely ISBN near the top. art