Mac has a tool named iSTAT MENUS as is shown below.

It's pretty useful in that it shows all the computer status (memory usage/CPU usage/network) real time on top of the menu.
Does Windows have similar tools? I know I can use Task Manager, but I want to have it on screen all the time.
4 Answers
Performance Monitor works with all versions of windows (except 9x and ME) and is a fair equivalent to what you are after. The built-in task manager utility only shows CPU usage. There are other utilities you can DL as well but I think this is the best.
1Download RainMeter.

It has more features than what istat can do.
0NetSpeedMonitor is great for monitoring network traffic speeds!
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4NetSpeedMonitor is a lightweight Network Monitoring Toolbar for your Windows Taskbar designed to be used on computers that run Windows XP, Windows Server 2003, Windows Vista or Windows 7. With NetSpeedMonitor you can monitor the current speed (up- and downstream) of your Network Interfaces and the amount of data transferred.
I was looking for the same and found:
Advantages:
- runs in the menubar
- free!
- relatively attractive