I'm running Surly New Hub (wow I like disc brakes!) front and rear, and sure do like them. I haven't checked weights/measures, but they have 32 holes for spokes, 6 for disc bolts, and one for the axle, and they roll real nicely. I think they have the sealed bearings, and they confused me with the appearance of having bearing preload adjustment (I'd thought that was loose bearing only).
I've paired them with Salsa Delgado Race 29er rims (by way of spiffy DT Swiss triple butted spokes, all one length, thank you singlespeed!), and the rear wheel has given me no trouble yet, after a whole week.. however, the front rim tacoed during stress relieving as I got close to tension, so I'm pretty well convinced that the rims are too light for off-roading (though Salsa was kind enough to warranty the rim) and I think I'll be relegating these wheels/rims to street use as soon as possible.
I've been riding them anyway, since I have waited long enough/too long to ride already, and though the front wheel is crazy wiggly, it hasn't been getting worse..
I've heard good about Sun Rhyno's and Mavic (who've introduced a 29er rim + wheelset, and already had strong 700c rims), and think I'll use some other rim from now on, though the Salsa sure is light and spiffy looking.