The latest version of the ISBN data is available in Business::ISBN::Data. The ISBN folks added several country prefixes and adjusted a lot of publisher ranges. I had to adjust Business::ISBN too since its set of tests used invalid ISBNs to test failures, but with the new data, those numbers are now valid. The changes only affect the tests, though.
The coolest bit is that the range data is now available in a PDF (although a text file is more appropriate) and it's a lot easier to parse than the fugly HTML they had before. I included in the new distro a script to parse that and recreate the data structure. This should make data updates much easier.