Quote - People put clothes on their poser figures??   Yeah, you can do that in Blender.  OBJ is the way to go.

Incidently, there have been problems with Blender and vertex order in the past for creating morph targets.  You may have to use a different script than the built-in obj import/export scripts.  Things also may not go into groups the way Poser likes them, either, I've had to manually edit that in an obj file before.  I'm not sure if that's still true in the most recent version of Blender, but it's something to keep in mind if you have problems.

Yes, people put clothing on Poser figures, otherwise, it is naked. 
FYI, with Blender 2.44 and above.  The problems with Blender and vertex order for creating morph targets is gone, all you need to do is specify that as "Morph Target" by using the "Morph Target" button in the OBJ Import and OBJ Export. 

If you want to have the groups in the way you can use it in Poser, you have to uncheck the "Objects" button, but select "Object Groups" and/or "Material Groups" depends on how you organized your objects in Blender.  I use both buttons all the time.  Of course, you may want to edit the name of your groups after it is exported.  You will need to do the renaming for conforming clothing because the group name generated by Blender does not match the bone name in Poser.