from Billboard:

For the first time in their 22-year career, Red Hot Chili Peppers score a No. 1 album on The Billboard 200. The two-disc "Stadium Arcadium" (Warner Bros.) sold 442,000 copies in the United States in its debut week, according to Nielsen SoundScan. The total is the band's career best sales week, beating the opening week of 2002's "By The Way," which bowed at No. 2 with 282,000.

Only double CDs get counted as two separate sales, which would make the actual number of copies sold 221,000. And Stadium Arcadium is a total poo slog. I liked over half of By The Way (Frusciante and Kiedis made that one all pretty-like) but had to strain to get through any track from the bloated newbie, whose overriding theme is that as long as young girls are moving to L.A., Tony Flow will be there to rhyme about them over jam excerpts from the Miraculously Majestic Masters of Mayhem.