There are several applications that allow you to design a trail around the web, so people can follow the trail and explore the various sites along the way. They can be used, for example, to introduce students to resources that will be useful in their studies. You can provide annotations and descriptions or not, as you prefer.
Jogtheweb www.jogtheweb.com
Trailmeme www.trailmeme.com
Pearltrees www.pearltrees.com
LiveBinders http://livebinders.com
While you're at it, you could also create a custom search engine by using the Google search engine creation tool at www.google.com/cse/
Phil Bradley in CILIP Update, May 2011