The tabular.xsl and chunk-tabular.xsl stylesheets produce a two-column tabular website. If you wish to produce a non-tabular presentation more suitable for text-only or audio browsing, use the website.xsl or chunk-website.xsl stylesheets.
It's possible to generate both tabular and non-tabular presentations in the same directory(ies). Use the filename-prefix parameter to put a prefix (such as “nontab-”) on the non-tabular versions (or put a prefix on the tabular versions, if you prefer).