New audio tool for iPads--Adobe Voice. Looks very easy with some options (e.g., royalty free music, add photos), but you have to email or embed--you can't download.
Youngzine is a great online magazine for students in elementary classroom--much news and other interesting information. Ties in nicely with Common Core.
TED (always love their videos--their app in iPad is great) now allows connecting YouTube videos with content for lessons. Lots of potential here...check it out.
DIY--public portfolio under parents' or teacher's email account. Designed for kids. Kids can upload videos and images of projects. Fairly new and worth exploring.
Grokking is new to me--looks like a powerful search possiblities that allows a mindmap of related terminology. You can create a teacher account, specify difficulty level, create graphs and more. Looks very interesting.