Aviary is a fantastic online Creative Suite of tools.  With Aviary you can create and edit images, vector images and create and edit sounds.  For any creative subject area or anyone looking for a different way of presenting ideas/working with information using art and music this one is well worth exploring.

Here is a link to Aviary where you can sign up for a free account.  Below are two videos which will give you an overview of Aviary:

Sound editing:

A number of ways to make use of Audio and Video have already been described under the Engaging category.  You can click here to see them.

Another option is an online tool named Jaycut.  Jaycut is an online video editing suite.

Here is a link to Jaycut and you can watch a tutorial below: