Welcome to Debian!
why do u wanna install 20000+ packages?Do u run Apache?these are for different purposes dude!just use gnome menu System>administration>synaptic package manager and see the uses of diffrnt packages...
I know u may be asking this after testing some distros like SUSE,Fedora etc which typically installs lots of pkgs which u dont use;is a wastage.
Mind it,Installing pkg in Debian is very easy..wait for an hour or so to get urself accustomed with apt-get
Unlike Open Suse,RedHat or Mandriva (rpm based) ,Debian,Ubuntu,mepis etc uses dpkg+apt-get for package management which is better if not the best.
if u can just go to gnome menu System>Administration>SYnaptic pakg manager.just browse to see what u want.get urself a good /etc/apt/sources.list
Debian Unstable is not unstable anyways though experimental repo is sure unstable
dont care for the words they gave for their different repositories(distros)
Debian is paranoid on security.Only ppl running servers or handling very critical datas care for the stable distro.so go for testing(lenny)
for newer packages.it even gets security updates.U can upgrade from ur stock Debian woody or sarge or ubuntu(?) or mepis(?) to Debian Lenny(testing) or Sid(unstable-jus for name sake)
I run Debian Unstable+experimental apt-pinned..that gets me bleeding edge packages.
make sure u have enabled ur sources.list.then in synaptic press reload.
OR
if u want terminal-
^^ give root password press enter
now debian(or any debian based) gets updates.so old versions of same packages junked in ur /var/cache/apt/archives.
do a:
Happy Using Debian.
I would like you to point to a resource Debian specific which will help u get working with Debian:
Debian GNU/Linux Desktop Survival Guide
also do learn about Debian's dfsg which makes it diff from other distros and Ubuntu.may be gentoo is one distro which can be similar to debian project.