01.02.07
Temperature Monitor
Performance Monitor

Temperature Monitor is an application to read out all accessible temperature sensors in Macintosh computers. The program can visualize the history graphs of the readings, display measured values in a large variety of fashions, or announce readings by speech output. It can also store and export values.
MenuMeters
Performance Monitor

MenuMeters is a set of CPU, memory, disk, and network monitoring tools for MacOS 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 PowerBook's small screen.
Cost Effective Website and Network Monitoring IPCheck Server Monitor - Free Download |
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IPMenu 1.1
Networking Tool

With IPMenu 1.1, you can instantly view and monitor your external and internal ip addresses. IPMenu 1.1 runs in the menu bar and has a very small footprint (CPU load). Internal ip addresses occur across local area networks and are generally assigned via DHCP by a router, whereas external ip addresses are assigned by the ISP.
Cee Pee YouPerformance Monitor

Cee Pee You is a Menu Extra that displays CPU(s) load in your menu bar. The load averages default to update every second, though this can be changed to any increment using the Cee Pee You GUI. CPU load is displayed as a percentage value in the Menu bar. Simple as that!