The MenuMeters monitors are true SystemUIServer plugins (also known as Menu Extras). This means they can be reordered using command-drag and remember their positions in the menubar across logins and restarts.

The CPU Meter can display system load both as a total percentage, or broken out as user and system time.

It can also graph user and system load and display the load as a "thermometer". The menu for the CPU Meter contains several pieces of information I like to have a single click away (uptime, load average, open Process Viewer, open Console).

Features:

Net meter now supports "orientation" preference to determine if transmit or receive is on top of display.
New net meter graph style "Inverse Opposed" that reverses the orientation of the "Opposed" mode graph.
Net meter menu content now includes peak throughput for the interface.
Narrow throughput display to 4 digits in all cases. Patch from Alex Eddy (arekkusu at mac.com).
Option to remove zero traffic baseline from network graph. Based on code from Alex Eddy (arekkusu at mac.com).
Net meter display uses separate color for inactive interfaces. Based on code from Da Woon Jung (quarkkiller at yahoo.com).
Disk activity indicator lights using color arrows on top of the boot disk icon. Based on artwork from Nate Friedman (natef at ForgottenNewbies.com).
All history graphs allow a shorter (11 pixel) length.


What's New:
1.3
[FEATURE] Universal binary for PowerPC and Intel.
[FEATURE] Swap file usage and encryption status on 10.4 (Tiger). Based on patches from Michael Nordmeyer
[FEATURE] Update load average calculation to better match 'top', patch by Michael Nordmeyer
[FEATURE] Disk activity indicator with large color arrows on boot disk icon. Based on patches from macrulez
[BUG] Fix problem caused by Cisco VPN where the primary interface (the VPN connection) can't be found in the interface list.
[BUG] Fix disk meter problem for volumes with UTF8 characters in the name (iPods are a common example).