Alternative to istat menu
MenuMeters is a set of CPU, memory, disk, and network monitoring tools for Mac OS X. Although there are numerous other programs which do the same thing, none had quite the feature set I was looking for. Most were windows that sat in a corner or on the desktop, which are inevitably obscured by document windows on a laptop's small screen. MenuMeters at the topmenu Requirements: Mac OS X 10.4 or later (10.7 supported) PowerPC or Intel based Macintosh (Universal Binary) Website