Can you perhaps also recommend a way to get the data from Maya to X3D?
Maya 4.5 has an X3D-XML exporter. It was written back in September so it is a fraction out of date, but not much. I believe you can find it in the developer SDK kit.
combine the info from both the files into multitexture nodes in a tool like X3D-Edit. However, the VRML-to-X3D converter that X3D-Edit uses does not seem to work correctly on the VRML-files that Maya generates
X3D-Edit is a bit out of date relative to Xj3D, that tracks the spec by the minute (at least the CVS version does!). There may be a few bugs though, so send us anything you find that really looks correct and we'll check it out.
can Xj3D somehow be used to convert from VRML to X3D?
Yes. In the latest development releases we have an example converter application that allows you to convert both directions and to either of the X3D file formats. They're still a bit underdevelopment, but they seem to work well enough for all our tests so far.
Shawn: I track all the known loaders at http://www.j3d.org/utilities/loaders.html
. If people have sent me a link to their loader, it's on there. Plenty more than just what is available in the code repository (although I would like to encourage more!).