Quality MTB forks with full carbon stanchions and forged alloy crown / drop-outs. Superlight, stiff these and excellent at absorbing bumps and they are an excellent alternative to suspension forks on smoother terrain or for riders who pick their way through the rocks rather than riding over them.
Check this forum on 29er carbon forks:
"I can highly recommend this fork. I've had this one since 2007, and it has been dinged, crashed, and thrashed since with no issues. I've had it on an On One Inbred, an OS Bikes Blackbuck, and this 2007 Salsa El Mariachi. (Plus maybe something else I can't remember!)
The ride isn't as flexible as the Origin 8, and probably more like the White Brothers Rock Solid. The forks most folks are mentioning here are in fact all made by one firm, but are made to different specifications. Their booth at Interbike last year showed at least a half a dozen variations of this fork, (Origin 8), and all had slight differences in lay up, details, and so on.