Bjano has rolled out iStat Menus 5 (http://tinyurl.com/meyfoge), an update of its menubar-based system monitoring tool for Mac OS X. It has eight separate menu extras for monitoring CPU usage, memory, hard disks, networking, temperatures and more.
Version 1.2 includes numerous improvements, including processes monitoring; enhanced Date & Time; enhanced bandwidth monitoring; better temperature and fan support; better support for temperature sensors in G4 PowerBooks, the latest iMacs and Intel based Xserves; disk performance monitor; and much more.
iStats Menus requires Mac OS X 10.4 or higher. It costs US$16 for a single user license or $24 for a family pack. Upgrades from version 3.x or 4.x are $9.99 for a single user license or $14.99 for a family pack.