Captioning Pictures

This is quite a fun tool. You can caption pictures, save them and then post to your blog.

http://bighugelabs.com/flickr/captioner.php

Adding Sound Files

Here's a link with some advice on how to add sound files (music) to your blog.

http://tips-for-new-bloggers.blogspot.com/2007/02/add-music-to-blogspot-blog.html