The School Library Websites wiki provides examples of best practice school library websites that covers Elementary (Primary), Middle School and High School (although there doesn’t seem to be any examples of High Schools as yet).

Many of the sites featured are from the US, but any school library professional is welcome to join and submit their own websites to the lists. As the wiki states:

This site is meant as a wiki-clearinghouse of effective practice.  It is, by no means, a comprehensive list. Rather, it represents the collective recommendations of participating colleagues. Please join us by contributing your own suggestions of exemplars of effective practice.)

In addition, there are links to

Our practice:
Reports
Book and Reading Promotion
Digital Storytelling
Inquiry/Information Fluency Instruction
Pathfinders
Digital Citizenship
Presentations
Building Tools
SchoolLibraryBloggers
SchoolLibraryTweeters
Knowledge Building Centers

This wiki is well worth a visit.