If you have KDE installed, start Konqueror and in the location bar, type man:and then the program who's manual you want,
This might not work for all man pages but for those that do work, this is much nicer than reading the manual in a console. I haven't tested this in Nautilus, I don't use Gnome, so it's not installed but try it and if it works, post your findings here.man:grub