If you're here to check out the Flexible Physics project, you might want to start with either: R9: Polarization of Light, which has neat Flash-based lab activities interspersed throughout the video, or R6: Resistor-Capacitor Circuits, for a fun video style.
Note to 104 Students: The Balmer Series lab is done online here. To just watch the Balmer Series video, use the link below: