Sitehoover is the top 2010 tool (Web 2.0) from Larry Ferlazzo’s The Best Lists on Technology in 2010.
It is great tool for sharing websites. A possible use for students would be compiling their recommended researched sites with annotations highlighting the reasons for the selection of each specific site (being critical evaluators).
This is a link to my library and ICT resources SITE HOOVER page (blog, wikis, twitter) that I created to evaluate just how simple it is to use.