On my old N82 I used QReader, but that does not work so good on my N8. That's why I searched for an alternative.

Albite Reader is an open source software for your N8. It looks great, and as you can see in the video has plenty of ways to optimize and make it fit your needs.

Implemented features via Official Website

anti-aliased bitmap font in four sizes with over 850 glyphs, including latin, cyrillic and greek
hyphenation for 29 languages
23 character encodings, including UTF-8 and most of ISO-8859 and Windows-125x
animated touch-guided scrolling
horizontal and vertical scrolling
on-touch dictionary look up
units conversion: temperature, length, area, ...
portrait and landscape view
images and basic styling
color profiles
portable book settings
table of contents