On Mac
Users/username/Library/Application Support/Adobe/Lightroom/Web Galleries/
On Windows XP
C:\Documents and Settings\username\Application Data\Adobe\Lightroom\Web Galleries\
On Windows Vista
C:\Users\username\AppData\Roaming\Adobe\Lightroom\Web Galleries\
In Windows XP, the “Application Data” directory is usually hidden. You must enable “show hidden folders” in the folder options before you can browse to it.
The Lightroom web gallery is developed by Thomas Menath from www.lightroom-tutorial.de. The website has more information about the LTD Coverflowe gallery
Highslide and Imageflow may be used in any kind of personal and other non commercial project for free.
In commercial websites both must be licensed. Highslide JS is licensed under a Creative Commons Attribution-NonCommercial 2.5 License. This means you need the author's permission to use Highslide JS on commercial websites.