I often search about commands and syscalls via internet because some man-page is not in a portage's man-page. It contains more page than man-pages-*.tar.gz : http://hany.sk/mirror/fedora/releases/7/Everything/source/SRPMS/man-pages-2.44-1.fc7.src.rpm We should include it, if it's possible.
If you want more manpages, then ask to get them included upstream. :) http://www.win.tue.nl/~aeb/linux/man/