International Data Group Singapore reports today that the Japanese arm of online retailer Amazon has received more than 10,000 customer registrations for the upcoming Sony PSP and Nintendo DS. The group also noted a "high level of interest" in the product page for the PlayStation 3. Registering their e-mail address with Amazon.jp allows customers to be notified as soon as the products are available for preorder on the site. The two pages have been open since June 9.