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I'd like to contribute some morphs. Is anyone building morph targets and if so, what is the preferred program? Since I'm using ubuntu, would anyone know if blender is the right app?

You can use any program you like, as long as you're able to get the morph back into Poser. Every program has its own peculiarities when handling obj files, but people have successfully used Blender for creating morphs, and someone should be able to give you some pointers, either here or in the Blender forum. Some of the critical points are not to have your modeling program split the mesh into separate objects for each actor (if you're doing PBMs or FBMs) and to preserve the original vertex order.

I'm a Ubuntu person, myself, and do all my modeling and morphing in Wings3D.

-- I'm not mad at you, just Westphalian.