Easy to install and administer, multiuser and ad-free- Wordpress is one of the most popular website building/blogging CMS.

Technology it’s based on: PHP

Pros: Free tracking options, hundreds of plug-ins, thousands of free and low cost templates, simple to use, customized installation, a lot of online documentation, growing developers, users’ communities, simple and instinctive (it has just three menus- write, manage, comments).

Cons: Tricky and limited customization (you can only make changes to headers, fonts, colors, widgets, plug-ins without an expert), you have to be able to figure out how to deal with CSS code), easily hacked (you have to keep up with the latest patches), easily spammed, below average SEO (can be improved upon by adding plug-ins)

Cost-wise: It’s free! You can buy a good template for $35- $100. But since, customization is tricky, you will have to hire an expert if you want to make a lot of changes to your template.

Modules/Plug-ins useful for enterprises: All in one SEO Pack, Google XML Sitemap, cFormsll, insights, NextGen Gallery, Flash video plugin, WP-PageNavi