SQL Fiddle is a new on-line tool that allows you to illustrate SQL DDL/DML. It currently defaults to SQL Server 2008 R2 but also supports 2012 and five other databases.
Check out a simple example here. This example shows the table and queries I built to answer this Stack Overflow question. When you build something in the tool, it automatically generates a unique URL for that schema/query pair.
Bravo to Jake Feasel for creating such a great tool.