Actually it depends on what you want to do. Wordpress also has a hosted solution (it's limited but a good start) at www.wordpress.com

It is built primarily for blogging, but can be used to host a site. If you need a corporate site or need to add many types of Intranet items such as file systems, Joomla is set up to operate more like a web site, and has blogging widgets. Check out their respective sites. Wordpress or Google's Blogger are easier to set up and use for a beginner.