If your students will be doing any research on the Internet this year, you should take some time to teach or review with them how to conduct searches. The Google for Educators community has nine lesson plans for teaching Internet search strategies. The lessons are divided into three modules. The lessons start with the basics and conclude with advanced search strategies. The Innovative Educator has information about an upcoming webinar on teaching web search strategies.
Common Craft's video Web Search Strategies in Plain English is an excellent introduction to any lesson on web search. You can view the video in Dot Sub form below or watch it directly on Common Craft here.
Here are some related resources that may be of interest to you:
Google Wonder Wheel in Action
Five Ways to Visually Explore Wikipedia
Scoopler - Search Delicious, Digg, Twitter, and Flickr