I've just added a function to the New Arrivals application on our website. Now you can limit any search to non-fiction by turning on the check-box in the customization area. You can get all non-fiction, or you can use other critieria to get non-fiction videos, kids non-fiction, etc.
For those who want to know, non-fiction here includes all the numerical call numbers, as well as the biographies. It does not by default discriminate among material types. The new functionality is seamlessly integrated with the RSS and printable views. It will occasionally (very rarely) return false results because some fiction items happen to have three digits in their call number.