There's finally a working CHM (and probably LIT) reader! Many thanks to cjacker!!!
I've installed the app and it's working fine for me.
Project page for MobileCHM is apparently
but unfortunately the server is down since a few days, so I put it to
http://rapid_share.com/files/89476259/CHM.zip (remove "_")
copy MobileCHM.app to the /Applications folder and place CHM files at var/root/Media/CHM
In some CHM files the content page isn't displayed - instead for example the cover picture (then "toc" is probably not included).
If you encounter this problem, decompile the original chm, change the default topic to the content page, compile it again and place the file in "var/root/Media/CHM". All steps are easily and very fast done by "In CHM" (Freeware, http://www.vistanita.com/inchm/introduction.php).