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.lit is basically a zip file with individual HTML/TXT and css files with metadata and optional support for DRM. It's basically epub lite.
.mobi/.prc is also basically a HTML container with support for metadata and DRM. Unfortunately it's even worse that .lit since it defines a proprietary extension to HTML.
.lrf is the compiled version of an XML based format (.lrs). Unfortunately the XML is used in a non-semantic way so it is not a good format for long term storage. However, it is the best supported ebook format at the moment.
Your best bet is to convert the book to XHTML and metadata to OPF. Package it all up in a zip file and your good to convert to any format in the future. Do not become dependent on proprietary formats or formats supported by a single app (like HTML0 the BD format, which is really just extremely crappy HTML). If you go the extra mile and make your zipped up HTML + OPF files into an .epub you can use the openberg firefox extension to view the ebooks on any platform.
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