jTrace was built using jQuery. If you haven't already checked jQuery out, do so now.
jTrace was written by Phil, and enhanced through testing and suggestions by Bert (aka Brett the Younger). Oddly enough, it was used to debug itself (seriously).
Further testing and suggestions during development were also made by Casey, Sid, Brett, Remo, and Drew.
jTrace is hosted on the E-com DevBlog (under developer training) and at labs.dutsonpa.com