From Wikipedia..."User experience design (UXD, UED or XD) is the process of enhancing user satisfaction by improving the usability, accessibility, and pleasure provided in the interaction between the user and the product."

From Ross...Good user experience design is crucial to application acceptance an success. Poor UED will inhibit user acceptance and create a difficult training experience.

Use common symbols or images to mark links. An image is superior to a text description and will make navigation more intuitive.

Organize access to content in an attractive and logical way. Try to avoid menu style content organization. Folder style organization is superior especailly if it uses images and symbols to indicate content.

All links should include hover over text describing where the navigation will take the user.

Related applications in the same organization should use similar or identical styles. A common look and feel goes a long way in encouraging user acceptance and is a valuable branding tool.