Multilevel TOC would be a point in favor of EPUB, as would be CSS2 support, but not if it meant reduced lifetime on battery or prolonged page turns. #7 pilotbob 10-02-2008, 07:30 AMQuote pepakMy uncertainty whether to use LRF or EPUB is mostly about which format is easier for my device's firmware - speed of rendering, power consumption, stuff like that.I would suggest creating the same ebook in