I have the netinstall distro of Debian. During the installation I can choose, for example "web server" or "Desktop environment".
Where can I find list of packages I'm installing?
tasksel will tell you this:
http://wiki.debian.org/tasksel
# tasksel --task-packages web-server (List the packages that would be installed by that task)
libapache2-mod-python
apache2-doc
libapache2-mod-php5
libapache2-mod-perl2
apache2-mpm-prefork
analog