LT Data Viewer Web Part Conditional Formatting
The Lightning Tools Data Viewer Web Part allows you to easily setup conditional formatting.
You can see a screencast of this article by clicking here:
LT Data Viewer Web Part - Conditional Formatting.
Quite often you need to know how to configure and use XML and XSL to style web parts. With the Data Viewer Web Part however all the conditional formatting you will need is available to configure in the UI of the web part with a few clicks of the mouse
Once you click Apply in the web part properties your formatting will be applied.
(click image to view a larger version)