This font problem in kpdf persists even in 6.10. Some files are probably worse than others, but a very simple PDFLaTeX generated file will demonstrate the problem. The more the document is zoomed out, the worse the effect.
See http://www.proxc.com/kpdf/ for 4 files - a test pdf file, and screenshots at 150% for kpdf in Kubuntu 6.10 and FC6 and xpdf in Kubuntu 6.10. The differences are smaller at this zoom level, but still very noticeable (especially lower case i's). -- Poor font rendering in kpdf https://launchpad.net/bugs/48146 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs