LAMP

Her royal pingdom lists...

OS: Linux 7 - Windows 2
Web server: Apache 7 - IIS 2 - Lighttpd 2
Scripting: PHP 4 - Perl 4 - ASP.NET 2 - Python 1 - Java 1
Database: MySQL 7 - SQL Server 1 (possibly 2)

And you should not be investing in some reasonable approximation to LAMP, again, because...?