I don’t have the opportunity to use plugins as much as I would like. Today, I stumbled upon one that I think has excellent UX. It is the jQuery LightBox. Keyboard shortcuts, nice fade transitions, great usability for next/back and pleasant titles.
If I were using a lightbox plugin, I think this is the one I would use.
What would be supercool is a lightbox plugin like this which can plug in the flickr or picasa thumbnails. I have to think this through.