Symantec has grappled with the same issue of whether or not to use StuffIt Expander 5.x that I confronted last week. They have chosen to use the 5.x technology, which means that you will need StuffIt Expander 5.x to decompress their March 1999 virus definitions (just released). (Thanks, Monty Solomon.)
CNET's giving away a 3D printer
Enter for a chance to win* the MakerBot Replicator 3D Printer and all the supplies you need to get started.