Finding missing packages

["jennyw" <jennyw@dangerousideas.com>]

I've recenlty posted some upgrade woes (Potato to Woody) ... I've noticed
that I have quite a few packages missing that I expected to be present. I
seem to have limited fonts in X for one thing (no sans serif, for example).
The Gnome Control Panel was missing. A few other things, too ...

Is there a way to grab all this stuff at once?  Like install everything for
Gnome and X that the initial installer would install without blowing away
the existing config?

Also, I'm a bit unfamiliar with all the packages ... there might be more
missing than just X related stuff. I know the Debian installer installs a
lot of stuff without mentioning specific package names (it might in the
advanced mode which I haven't used) ... is there a way to get a list of
packages the installer installs by default?  And also the packages that
correlate with the general names it uses?

Thanks!

Jen