The Nintendo DSi has been released in North America—the last region to get it—for USD$169.
While the only DSi-exclusive games available in North America are AQUIA, Birds and Beans, Master of Illusion Express: Funny Face, Brain Age Express: Math and WarioWare: Snapped, there may not be much reason to buy one just yet. If you don't have a DS, but would like to get one, it may be worth USD$50 more than the DS Lite costs. If you already have a DS Phat or Lite, you'll probably want to wait for some bigger exclusive titles.
What do you think of the DSi? Will you be getting one?