Newb Repo Questions

Hi all, I'm familiar with apt and editing sources.list, I've just got some general questions regarding the different repositories and such.

What's the difference between http://archive.ubuntu.com/ubuntu/ breezy and http://archive.ubuntu.com/ubuntu/ breezy-updates ?

Also, what's the difference between restricted and multiverse? Is it that restricted is officially supported, but multiverse (like universe) is community only?

Perhaps if someone could provide examples of the sorts of packages that you would see in each it would give me a better understanding. For example where would you see binary nVidia drivers, or blackdown?

Visit http://archive.ubuntu.com/ubuntu/ and browse around. Or, go to http://packages.ubuntu.com/

Just add all the sources... they give you all the functions that you need... The more sources you add the better! (as long as they belong to the project) you just don't want to add sources that you don't trust