A superb piece of software that puts some extremely useful icons (and graphs and arrows and all-sorts!) in the menu bar for visual feedback and they all have drop down menus for giving you far more information than you could reasonably expect from a free product. Space used is minimal considering the information provided. Icons have a high degree of customisation to show the info in the way you'd like it.

The Network meter is great for seeing what's happening traffic-wise and the drop-down menu gives you the info about all your interfaces, including throughput, peak traffic and Tx/Rx data totals.

CPU meter shows at a glance how much 'oomph' is being used. Dfop down menu shows loads (1 min, 5 min, 15 min averages), uptime and other stuff, and gives you a way to open the Activity Monitor easily.

Disk meter shows read/write activity (a bit like the old Symantec Disklight). Drop down menu shows disk usage, mount point and format type.

Memory meter shows usage (active, wired, free) and can shoe pageins/outs if you need that sort of stuff. The drop-down menu gives you VM and swap File stats for the geeks among us!

The developer is extremely responsive. I reported a bug and 36 hours later a new version appeared in my in-box. If only every developer was like this!

If your menu bar isn't too cluttered already then give it a go. As my mum says: "try it, you might like it!"