Below is a brief tutorial on Poser/Daz characters to Motionbuilder. Works great. BUT ... when you add Poser/Daz characters with CLOTHING the clothing has separate rigs on it. When you bring that in to Maya/Motionbuiler how do I associate those Poser/Daz clothing rigs to the character so Motionbuilder will recognize or constrain it? Other than the clothing issue all works super great. Here is brief tutorial ....

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Getting Daz/Poser characters in to MotionBuilder via Maya is a breeze and takes me less than 5 minutes. Just use the opencollada plugin for Maya below. Export character from Daz via opencollada. Import in to Maya using the opencollada plugin listed below. Rename the bones to the Motiobuilder names below. Export to Motionbuilder, characterize then all done. You can even use Mayas REDUCE MESH to lower resolution of Daz/Poser high resolutions before exporting.

http://www.opencollada.org/download.html

hips
LeftLeg
LeftUpLeg
LeftFoot
RightUpLeg
RightLeg
RightFoot
RightShoulder
RightArm
RightForeArm
RightHand
LeftShoulder
LeftArm
LeftForeArm
LeftHand
Head

Thanks for your quick response Brad. Thats what I kind of figured is to do that as character extensions in Motionbuilder. Keep in mind these rigs (like lets say a Daz characters pants or shirt) has a full hierarchy rig on it ... so using that as a character extension will be something to figure out) Is there anything I can do in Maya before I export or is MB character extension the best way to do it?  Thanks much. :)

Just an update to all interested in this Poser/Daz Maya Motionbuilder pipeline. Iam finding that the I now can grab a Daz character (there are dozens free in the public domain and hundreds of paid ones) bring it in to Maya as mentioned in my tutorial and within couple minutes rename the bones for MotionBuilder. Characterizing in Motionbuilder only takes a minute. The quality of the characters coming in to MotionBuilder is awesome. All the Daz/Poser skinning is just so good. Here is a quick youtube video I just did. All this including going from Daz to Maya to MotionBuilder, characterizing, adding some bvh clips, fire, etc AND RENDERING TIME IN MotionBuilder was less than 15 minutes total. Now that is really awesome. Here is youtube video ..

http://www.youtube.com/watch?v=lSvJ9DQp5n0

Now, as mentioned before I must figure out how to get the CLOTHING (clothing in Daz Poser has rigs on it) to conform to my characters in MB. Still working on Brads idea of MB character extensions.