After an 8-hour hackathon I'm happy to announce mobi2oeb. Converts (non DRMed) .mobi/.prc files to an exploded OEBPS ebook. Supports all three levels of compression in .mobi files. Part of
libprs500 v0.4.37. To use
This is an initial release, so expect bugs. Thanks to darkninja for the HUFF/CDIC decompression code.