Update: 2010 I would highly suggest moving away from MacPorts/Fink and to use Homebrew by Max Howell.
Update: The nice people at MacPorts have update the package to v1.8.0. You can follow their instructions to upgrade to the latest stable version. I would suggest the MacPorts v1.8.0 for OS X 10.6 DMG file.
After installing Snow Leopard, you may want to install the MacPorts. Follow the following steps to get it up and running:
1. Download and install XCode from ADC.
2. Open up the Terminal
svn co http://svn.macports.org/repository/macports/trunk/base/
sudo make install
sudo /opt/local/bin/port -v selfupdate
sudo port upgrade --enforce-variants (Did not work for me)
sudo port upgrade outdated (Did not work for me)