koobe is a little script that can open both .epub (IDPF Open ebook spec) and even .lit (through convertlit, as openberg) in Konqueror.
It opens ONLY html or xml based ones, you can`t view the pdf alternative through this script.
( Hopefully someone will find the time in the future for a kio_slave or at least for .opf support in konqueror... by that time I`ll remove this hackish script )
┬· unzip (for .epub files)
┬· convertlit (for .lit files, please read legal notes of convertlit)
┬· additionally you need to have mounted a tempfs file system in /dev/shm