Update: we also highly recommend the OSEmbed extension for embedding code in Joomla.
If you build websites with a CMS, then you probably have a love-hate relationship with your site's text editor.
The editor makes it really easy to create formatted pages. But, editors can make a mess of any code you try to use.
Sourcerer from NoNumber.nl is a great way to solve this problem inside Joomla. If you put your code inside Sourcerer's tags, the code will always work correctly.
Here's an example of using Sourcerer to add a Google Map to Joomla: