Which ebook readers for Windows allow two-column view and left justification? Calibre and Sumantra allow two-column view but not left justification. I find left-justified text faster to read. This is in accordance to typographer's opinion.
BlueFire Reader displays the text in multiple columns, and you can set the alignment to left or justified. The alignment setting shows up when you check the advanced settings box in the settings dialog (the gear icon in the toolbar).