Cilia and flagella are tail-like extension that some cells have that help in locomotion.

5.8: Activity: Flagellar movement
5.8: Activity: Flagellar movement, Discover Biology 3rd Edition, w.W. Norton Company, "Explore the molecular basis of movement in microtubule-based systems."
Biology Animations: cilia and flagella animation video
Biology Animations: cilia and flagella animation video, Video length: 0:35.
Cell transportation - Science for Kids
Cell transportation, By Carr, Karen (PhD), Science for Kids, Explains how prokaryote and eukaryote cells began to move themselves around. Video length: 03:12.
Cilia - Flagella
Cilia - Flagella, Brightstorm Science Videos, Video length: 02:40.
Cilia and Flagella
Cilia and Flagella, By Regina Bailey, About.com Guide, "Explore the structure and function of the movers of a eukaryotic cell, cilia and flagella."
Cilia and Flagella
Cilia and Flagella, By Gwen V. Childs, Ph.D., Text and illustrations on cilia, flagella and centrioles.
Cilia and Flagella Video
Cilia and Flagella Video, DNAtube.com, Video length: 0:35.
Cilia and flagella: Information from Answers.com
Cilia and flagella Answers.com Short encyclopedic article.
Cilia vs. Flagella
Cilia vs. Flagella, MicrobiologyBytes, Explains the difference between cilia and flagella; has three videos.
Cilia, flagella, and pseudopodia
Cilia, flagella, and pseudopodia, Team 27819, ThinkQuest.org, Created by students for students, this page explains their function.
Cilia: Biology's Brooms
Cilia: Biology's Brooms, June 27, 2012, By Amber Dance, for the National Institutes of Health, LiveScience.com, Read about the important functions of Cilia!
Cilium Kids.net.au Encyclopedia
Cilium, Kids.net.au Encyclopedia, Brief article describing cilium.
Difference Between Cilia and flagella
Difference Between Cilia and flagella, DifferenceBetween.net, "Cilia and flagella are auxiliary parts of living cells." This webpage explains each one's function.
Flagella & Cilla Movement Animation
Flagella & Cilla Movement, Department of Biology, Northland College, Great animation!!
Flagellum Kids.net.au Encyclopedia
Flagellum Kids.net.au Encyclopedia, Description of bacterial flagellum, archaeal flagellum, and eukaryotic flagellum.
What Are Cilia?
What Are Cilia?, Written by S. Mithra, Wisegeek.com, Article on the types of cilia, their function and structure. Includes several images; click to enlarge.