The best Sony format to
Kindle format conversion I've found is a 2 step process:
1. From .lrf/lrx to html using the ABC Amber Sony Converter available from
http://www.processtext.com/abcsonylrf.html
2. Then I use the Auto Kindle eBook Converter 0.4.50 available from
http://www.download.com/Auto-Kindle-...-10907625.html
to convert from .html to .mobi/azw
These 2 programs are free, easy to use and produce a very readable product.
I did find that making a (disposable) folder on my desktop to use in this alchemy was most handy.