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the best way to insure maximum longevity is to favorise open formats and formats which do not encode the text too deeply. the .lit format is a thin wrapper over an html core which can easily be taken apart into its composing elements, which is good for archiving purposes as well as conversion to other formats. if you want to buy a book only available in drm formats this is probably the best one.
otherwise, it's a good idea to support open formats and notably the epub format which is the new industry standard ; since it is made using xhtml format for the text and css rules for the styles (the same formats used in web pages for instance) it can be read using a variety of programs. and the container can be unzipped using winzip or winrar for instance if you want to get at the core html text. it's highly unlikely that it will become so obsolete as to be illegible anytime soon. also it can easily be converted into any other format, if necessary, and is already supported natively by the sony 505 and soon by the bookeen cybook.
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