Upgrading Drupal

I can't seem to find the book module (the one that organizes pages). I've found a bunch of modules that talk about adding functionality to the book module but none that linked to the actual module.

Well, I finally finished setting up my site and looked at the registration and most of the users... lets just say I don't want them here. I looked for a capcha module but didn't see one anywhere. Is there a way I make the registration page a little harder to use? So far only one of them has actually made it all the way through others failing at checking their e-mail or not finding a way to post.

Anyone know of a module that gives a wiki functionality to drupal? I've only found wiki filters and not anything that allows users to make pages that don't exist. 404 wiki does this but it kinda is outdated.

I'm wondering if it is considered best practice to always apply every update to your modules even if the updates are not for security purposes. For example, if I have a module that puts out a new upgrade with a new feature, should I update that module on my site even if I'm not interested in the new feature? What do most people do?

I'm looking to add a forum and wiki kinda like...

http://netgore.com

But no matter what modules I find they fall short of what I'm aiming for.

Hi, I'm trying to set up a forum but it seems that the link to the forum page returns this...

http://arch-games.com/forum

But the links to an actual topic or container works just fine...

http://arch-games.com/forum/1

Does anyone know why or how I can get the forum page to show all of the forums?