The Nintendo Wii is still flying off of shelves -- even in the middle of summer -- a development that has to have the folks at the company's U.S. headquarters in Redmond feeling pretty good going in to next week's E3 conference.

With all three next-generation consoles launched, the toned-down video game confab in Santa Monica, Calif., will likely focus on upcoming games for the holiday season. But you can bet that Nintendo, Microsoft and Sony will be touting their console sales numbers -- or spinning them -- and Nintendo has plenty to crow about.

An AP story out of Japan this morning reports that the Wii outsold Sony's PlayStation 3 at a rate of six to one in June. The Wii also outsold Microsoft's Xbox 360, according to the statistics from Enterbrain, a publisher. Nintendo seems to be succeeding in its strategy of selling the console to a broader demographic.

From the story: "The Nintendo's game console is catching on not only among children but also adults and singles," said Enterbrain spokeswoman Yuko Magaribuchi.

Sales in the U.S. are going gangbusters, too. While Friday's iPhone lines got most of the attention, people are still queuing for fresh shipments of the Wii, more than seven months after it launched. See this AP story for details, including this one: Inside a Brooklyn Toys "R" Us store, "the systems didn't even make it to the shelves before they sold out."