Yes, I have the dll and so files for other platforms, you can download them here:
http://maven.artenum.com/content/groups/public/vtk/vtk-native/5.6.1/
I have tested the Windows and MacOSX versions. The Linux version is not tested yet however. And I still have to generate the Linux 64bits version.
Also, for now, I just have an OSGi bundle on OSX. I still have problems on Linux (which I will share on my next post) and haven't tried windows yet.