The Web Application Installer Beta is designed to help get you up and running with the most widely used Web Applications freely available for your Windows Server. Web AI provides support for popular ASP.Net and PHP Web applications including Graffiti, DotNetNuke, WordPress, Drupal, OSCommerce and more.

With just a few simple clicks, Web AI will check your machine for the necessary pre-requisites, download these applications from their source location in the community, walk you through basic configuration items and then install them on your computer.

This web installer is now available for free in Beta stage, and moreover would be loved by people for helping in installation in some of the website platforms such as Wordpress, Drupal for blogging, OSCommerce for shopping websites.
As to what Microsoft says:
The beta release will include DotNetNuke, Drupal, Gallery, Graffiti, osCommerce, PHPBB, and Wordpress. New applications will be evaluated and added to the Web AI Gallery regularly.

Supported Operating Systems are: Windows Vista RTM, Windows Vista SP1, Windows Server 2008.

This can be downloaded here.
This client would make it easier to use and install any web platforms easier than earlier. Unfortunately there is no such software or app for mac users.