This is a list I created over 4 years of teaching middle school Spanish of great youtube clips, Teacher Discovery videos available for rent and purchase on Amazon under Amazon Instant video, and video clips from the Avancemos textbook website, which are free organized by unit. It matches exactly with the textbook Avancemos 1A, but could be used with any textbook since I'm sure you might have the same units for middle schoolers learning Spanish.
The units included are:
Ser/description of others and self
ar present tense verbs
er/ir present tense
Direct object pronouns
irregular present tense verbs/acabar de/tu commands
holidays/just for fun
There is also a list of a view useful websites as well. Enjoy!