I'm going to start testing this out this weekend because if I can convert files to MOBI when I add RTF files to the Ebook Library I can also add a mobipocket version (assuming what comes out looks good) I may need a few Kindle/iLiad/Cybook testers when I make mobipocket files.
Mobipocket reader is great and all, but if it's anything like the sony LRF viewer, it's not going to be perfect.
http://calibre.kovidgoyal.net/