Today iSlayer released iStat Pro 4.5 which not only updated the UI and some of the standard features, but added some new features as well. From iSlayer's blog:
Updated network section with new details & controls for PPP/PPPoE connections
Improved PPC temperature and fan support
Improved Intel temperature support
Improved S.M.A.R.T. drive temperature monitoring
Fixed bugs with battery section and 10.5
Clicking on a disc icon will now open the drive in finder
New keyboard shortcuts ("g" - Update external IP, 1-8 - Change skin color)
Added button to launch Activity Monitor
Other various bug fixes
Various UI tweaks
Activity Monitor launcher
The ability to launch a drive in Finder by clicking on its name
iSlayer Pro 4.5 is available for Intel and PPC Macs running Tiger or Leopard and is donationware.
Do you have to uninstall the old version before you install this or is there an updater?