I've been testing the
LRF tools to convert my lrf books to ePub. I have to say that I'm very impressed with it. The formatting is great, it works in batch mode and it keeps the directory structure intact. I use Calibre for my books, so pointing it to my library, and having it all output to a new directory is very straight forward. I think this is a great way to transition from lrf to any other format.
It outputs lrf as XML, PDF, RTF, HTML and ePub. From here, you can convert easily to anything else. It also has switches to help clean up hand made ebooks that may have formatting errors, as well as the ability to set custom formatting options.