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When using apt-cache to find the reverse depends of a package
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Use
apt-cache rdepends <package> for this.
Or for the dependencies of a particular package use
apt-cache depends <package>.
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it would only show dependencies for packages in repositories that you have added wouldn't it?
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That's correct.
You add an entry in your sources.list than do
aptitude update,then the new packages should be available to you.
In some instances you may need to install a 'keyring' for the appropriate repository also.
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Apt -update updates the list of packages that need to be updated.
Apt -upgrade upgrades the necessary packages.
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Debian advocates the use of Aptitude now and has done since Etch went Stable.
So the way to upgrade now is:
aptitude update
aptitude safe-upgrade
Or a more 'aggressive' upgrade installing new libs to satisfy dependencies use:
aptitude full-upgrade
You can still use apt-get of course.