Fotobabble

Fotobabble offers an interesting mashup of sound and image.  Upload your photo and then record a short audio blurb about it.  You can share it on email, Facebook, Twitter or embed it on your blog or website. 

There are no fees, though you do have to register for an account to use the service.  It is entirely web-based, so no downloads either.

They also have an iPhone app that you can use and be able to Fotobabble your entire day.

I can see libraries using this to create an interactive tour of their facilities without a video camera.  All it takes is a digital camera and an online connection.