So I bought my black 3DS, and have played with it for a few hours. Here are my good's and not-so-good's for it:

The good:

1. 3d is much cooler than I expected and not used in gimmicky, stupid ways. 3d photo taking is groovy and works well. The 3d use in the two games I bought (Street Fighter IV and Ghost Recon) are effective. Don't expect miracles -- you won't be able to tilt your head and see around a corner, etc. but it provides a nice sense of depth. For example, in Ghost Recon, in bird's-eye view of the map, you get a nice sense when bad guys are below or above you in a multi-level building.
2. The built-in games are super simple, but show off the system very nicely. The Augmented Reality (AR) games are pretty simplistic, but what they do is very cool -- the image processing on-board the system is great. For example, you'll lay an AR card on your kitchen table, and the AR game will warp, bend, and tear holes in your table, and it looks actually pretty darned realistic. It will be muy interesting to see how this gets used.
3. The system's overall feel is very solid, not cheap. It's heavy and a little chubby, but feels fine in my hands. The 3d screen is on top, and is large, while the bottom screen is just like the DS lite.
4. The system can FINALLY use WPA/WPA2 wifi access points. *whew* I was dumbfounded when the DSI XL still didn't support WPA access points, but we're now past that...
5. The first system update gives you a 3d music video -- OK Go's "White Knuckles" -- cute!
6. Menuing system is quite a bit better than the DS, and obviously mirrors the Wii.
7. Mii sharing system shows some promise, but we'll see if it works when I'm out an about. Since I'm a 40 year old engineer, I'm not sure where I'll run into other 3DSs as I wander but maybe I'll just go hang out at Chuck E Cheese and see what happens... :)
8. The ability to suspend a game, go back to the system menu and write notes for that game is very cool.
9. System ships with a charging dock, AC power adapter, and a 2GB SD memory card -- nice touches.

The not-so-good:

1. Still no web browser or marketplace for games yet. No real date on when yet, either. Given the limited number of launch titles, your 3DS may get a bit lonely until Summer...
2. ~3-4 hours of battery life, but plays while plugged in, so not too bad. However, the system has some cool proximity features where you just put the unit on standby, and as you walk around, it will sense other 3DS's and exchange info, Mii's, etc. which gives you points. For encouraging that kind of activity, 3 hrs is pretty sad...
3. The stylus sits in the system vertically on the left side of the unit behind the hinge of the screen, so it's awkward to remove and replace when the system is open. Presumably, it's the only open space they had to put it...
4. Because of the direction and location of the stylus slot, the stylus is super short but extends to normal length. But it's hollow cheap aluminum, and feels terrible, very cheap and flimsy. Yuck.
5. Shoulder buttons feel great now, but stick out enough that I'm afraid they will get banged up quickly and could break. Time will tell. Probably good to get a case for it.
6. No ability to shoot 3d video (yet? will it ever?). I wanted to try placing some 3d glasses against the 3d camera lenses on the back and seeing if it could film a 3d movie from a 3d tv, but no luck yet...
7. The system wouldn't recognize any of my 4GB SD cards... either it needs something higher speed, or it doesn't support high density cards. If it's the latter, I wonder if that's a copy protection issue? Supposedly games may be up to 2GB, so if you can't put more than 2GB in the system...??? I dunno. Still, lame.

That's all for now...