[Geschpooklichkeit]

1. If by this you mean transferring image files, you can transfer the images between drives using any method you usually use for copying large files. I don't quite understand what you're asking here.
2. ImageCenter is recommended overall, but I would recommend the Acronis True Image products (the latest versions) if you work with Linux partitions. Unlike ImageCenter, True Image can actually do stuff with ext3 partitions other than create them. The Home edition can even mount image files as drives so you can take whatever files you need from those.
3. I don't know of any free imaging programs for Windows.