Use case:

When I install Ubuntu on another computer, I need to:

• install all the packages that I use;
• make some config changes;
• svn checkout some projects;
• git clone some projects;
• setup .ssh/config;
• download a custom Eclipse build;
• download some additional Eclipse plugins;
• make many other tweaks.

So, I want to run a script, like sudo install-everything-needed, that would execute these predefined actions.

Is there any package that provides the backbone for such system?