Here is a simple clean free Corporate wordpress theme:Corporate
This free Corporate wordpress theme is a two columns, right sidebar, fixed width wp theme, has two color scheme:orange and white. And this free wordpress corporate theme is easy to customize.Great for businesses, corporate blogs and web sites.
Here is a snapshot of this clean Free Corporate WordPress Theme
Demo / Download free Corporate WordPress Template
This theme Comes with customizable intro text, for information read Instructions.txt.
Cross-browser, XHTML Strict v1.0 and CSS 2.1 valid.
NOTICE: This version contains a few critical bug fixes, so make sure you have the latest version.
And here are more corporate themes for wordpress: