HP has some interesting naming conventions. The current version of the Utility for my Z3100ps is 4.4.2, from last December. They don't seem to update things on the PS side as often as the raster driver, so I have no idea how we managed to get as high as version 4. It is a slightly improved interface, and may be a touch peppier. Thankfully, the Printer Utility has always been stable for me and never introduced problems with their "improvements", unlike a few firmware upgrades. Oddly, the correct name on the application is actually HP Utility (at least on a Mac), and HP Printer Utility is what used to be called the HP Printer Selector (if memory serves me correctly). The HP Printer Utility opens the HP Utility for the chosen printer. Really a useless step, since the HP Utility allows you to choose which printer you want to work with.