couple linux(deb) questions

[Littlefield, Tyler]

Hello list,
I've got a couple questions.
First, is there a way to find out what libs are installed, but aren't being depended on? I know I have extra packages, and don't want to keep them if I don't meed them, e.g libraries mainly.
Second, is there a way to get all my manpages installed? I used to be able to do man cfunction, and I could see something, now I don't get anything. I believe I'm missing a package, just not sure which.
Thanks,