jQuery Popup Window Tutorials

jQuery LightBox Plugin
http://krewenki.github.com/jquery-lightbox/

jQuery Popup Login Dialog Box
http://buckwilson.me/lightboxme/#

jQuery Facebox Fancybox Plugin
http://bitbonsai.com/facybox/

Login box Modal Dialog Window with CSS and jQuery
http://www.alessioatzeni.com/blog/login-box-modal-dialog-window-with-css-and-jquery/

jQuery Modal Dialog Windows
http://leanmodal.finelysliced.com.au/#

Popup Dialog Windows using JQuery
http://www.ezzylearning.com/tutorial.aspx?tid=6942119