Sorry, I can no longer maintain a presence on the SL Marketplace to distribute items directly in-world.
However, please feel free to download the source code for this tool below.
This is a single LSL script which you can use when presenting slides of information in Second Life. First, create each slide as a flattened box (or any other shape you like), with the front facing on its local +X axis. Next, put this script into each slide. You can then click each slide to toggle it to the foreground or background, and (as of version 1.2) optionally have an auto-reset timer which makes slides go back to background after a set period of time.
Foreground slides are full-bright and enlarged, while background slides are semi-transparent and at their original size. You can customize everything reasonably easily by changing variables at the top of the script, including who has access to control the slides.
Get the scripts
Video