Toon

There's so many about and so many different styles I thought I'd share some of them here...

Slimbox
LightWindow
Lightview
phatfusion : multibox
prettyPhoto - jQuery lightbox clone - by Stephane Caron
iBox - Lightweight inline popup
Shadowbox.js Media Viewer
YUI Lightbox Demo - Code Central
Control.Modal : Lightboxes, Modal Windows and Tooltips for Prototype
http://jquery.com/demo/grey
Lightview for WordPress :: iLEMONed

Not just for web designers but great for graphic design portfolios also

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