This blog is an amazing resource about technology in music education. The 5 co-authors present a plethora of resources, and write about their personal experiences using them.
This is my favorite site for games that can be used as informal, formative assessments. There are many options under the "Quizzes/Pianos" tab. The games can be played as a class using the smartboard, or individually if you're lucky enough to get time in the computer lab.
Another great website for teaching music. There are many interactive games, some great videos about composers in the time machine, and tools to help kids compose and improvise together.
This is a great website that has a ton of information. It includes interactive games, sections about each orchestral instrument, a composer's workshop and many other fun activities.
I love using this website to teach about the orchestra. There are so many interactive activities that involve the orchestra, music theory, composition, conducting, and many other activities.
This list of podcasts has the TED talks that focus on education. While not all of them deal with music education, they have some great insights on general pedagogy, creativity, and teaching.
This is a page on the Music Matters Blog reviewing the InTune App available on iTunes. This app operates on a game platform and has students distinguish which pitch is higher or lower. Pitches get progressively closer as the level increases.