I just upgraded the Lightbox 2.0 plugin I use for my WordPress installations. I use Lightbox 2.0 extensively for snazzy image loading effects in my blog and all the other sites I run. The script loads images in an overlay window and dims all the other parts of the page.
You can try it out with the photo that comes with this post (it won’t work, though, if you read this on an RSS reader or in your e-mail, you have to go to my blog).
In the new version, WordPress Lightbox 2 0.6.3, the lightbox button now works with the WordPress post editor, albeit only in the code view. In previous versions, you had to save the post before the lightbox button appeared. The new version only supports WordPress 2.1 and higher and uses the Prototype and Scriptaculous library that come bundled with WordPress. The new version now allows you to easily enter group names for photo sets.
In upgrading from earlier versions, I suggest you disable the plugin and then delete the entire folder before uploading the new version. I tried just overwriting the plugin and encountered errors.