Marketing metrics on the grid -learn who's visiting.
A little script to tell which prim in a link set has been touched.
integer link = llDetectedLinkNumber(0);
llOwnerSay("This is link #" + (string)link);
Word is that the new llSetLinkPrimitiveParams() has the 0.2 second time delay and will only allow work on prims using the standard constants (all, one, all-but-root, etc.) So, sadly, there'll still be a script in every prim in a lot of projects.