I came across a lightbox style plugin for jQuery called Colorbox, developed by a designer/developer called Jack Moore over at Colorpowered. It looks great, there are some nice parameters that you can set, I especially like the fixed width or height, and you can also include video, external and inline content as well as other sites in an iframe.
I’ve looked at lots of different variations including Fancybox, Greybox, Thickbox as well as Lightbox itself but I think this one is the best I’ve seen.
It is also released under the MIT License. Good work Jack!