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This doesn't work!

Please file any bug reports on the latest release post at http://samwilson.id.au/blog/plugins/image-flicker

Can this plugin handle mulitple, different, slideshows?

No, not at the moment, sorry. You could always ask for this feature if it's really important to you!

How can I make the description display below the image in the sidebar, and get rid of the underline from the link?

Try the following CSS in your theme's style.css file:

#image_flicker {text-align:center}
#image_flicker img {display:block; margin:auto}
#image_flicker a {text-decoration:none}