Web Analytics
Web analytics has great potential for libraries. Not only is the website that primary contact for libraries with patrons, for many in the natural sciences it is the library. In addition, web analytics and web testing tools can provide supplemental data for every library program.
Google Analytics for Libraries
Here is a free guide on web analytics that is specific to libraries.
All I ask is that if you like it, email the link to a colleague, put a link in your blog, mention it on twitter (@joesmorgan) or somehow get the word out.
Click here to download: 
Click here to download just the chapter on using Google Analytics Metrics in libraries: 

Google Analytics for Libraries is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States License