This looks like a pretty cool app for the iPhone/iPod touch/iPad which will allow you to record student voices and the app will sync a sock puppet with the recording - you can then upload to youtube. Check it out...
NASA has an excellent interactive timeline tracing the history of astronomy and space exploration from the Greek philosophers through the current day.
Planet Quest is actually three timelines combined into one. The three timelines cover technology, discovery, and culture as it relates to astronomy and space exploration. Each element on the timeline is narrated. Users can select individual elements on the timeline or choose autoplay to hear the narration of each item in sequence.
Exploratree is a great site for educators to use for creating mind maps or brainstorming. This is an easy site to use that allows for group collaboration and comments as well. Best of all, Exploratree has a number of different templates to choose from to find the right "mind map" for you.
Great collection of video tutorials related to SMART Notebook/SMARTBoards - Tutorials are windows-based, but skills taught are easily transferable to the mac.
Great website for learning about writing letters. Goes through requirements of both Personal letters, and Business letters. Lets you print/save the document as a final product.