In Japan, yes. However, WW it's at about 40% of PS3's sales, and in Japan it's still well behind the PSP. It'll likely catch up, though. It's also coming up on Wii's sales in coming months.
Y'all need to calm the **** down and wait for E3. You Sony fans have your kii but once Zelda or Mario gets released it will be the same old slayage for Nintendo. If you really want to see a dead console look up the Vita.