Nintendo DSi. According to whomever, the system will be released on April 4, for a crushing $179.99. It's still a deal compared to the Japanese DSi, which retails in Japan for 18,900 yen ($212) and can be imported for $250, but it's also $20 less than an Xbox 360 and $10 more than a PSP.
This timing basically falls in line with previous comments from Nintendo about the DSi's North American release. Reggie Fils-Aime said last fall that the system would launch "certainly after April", but context indicated that he meant within fiscal 2009, which starts in April.