My cousin got one for christmas, and I was blown away by how cool it is. However, it looks like it’s “permanently” sold-out; it was the Tickle-me Elmo of this Christmas season. Does anyone know when the thing will actually be available in stores again?
It’s a cool device, but I strongly recommend checking out the PSP, I imported that and it is so good! Plays mp3s, mp4s, jpgs, games of PS2 quality (but sharper/non-interlaced) has crazy sound, and its widescreen is of such awesome quality that you have to see it to believe it.
I’m just saying - I’m an expert on consoles, and there are going to be DS people and PSP people, and it may be worth checking out which one you are to determine if you really need both. 
I don’t think the stores will be out of them for very long. Some places here in the Hartford CT/Springfield MA area still have a handful of them on the shelf.
I went into Best Buy yesterday to spend a gift card. They had tons of them.
Chicago’s Best Buys is sold out; however, they’re flying off the digital shelves at bestbuy.com. Must have gotten a shipment in and put them in the database as “in stock.”