I would like to see ISBNs linked to AddAll.com rather than Pricescan.com. I think the selection of bookstores is better including used books and as AddAll is devoted solely to books less of a distraction.
To test the two alternatives go to:
http://www.wikipedia.com/wiki/creative_accounting
The book at the bottom of the page temporarily has two ISBN links, the top one to AddAll, the bottom to Pricescan.
Fred Bauder