This utility allows you to monitor a variety of system info in "always on top" floating window (overlay mode).
Available meters:
- CPU Usage meter
- Free RAM meter
- CPU Frequency indicator
- 2g/3g/Wi-Fi Traffic meter
- Battery Level
- Battery Temperature
- Battery Current (mA)
- Wi-Fi Signal Level
- Current Time indicator
- GSM Signal Level
- Number of fixed GPS satellites
- Most resource-intensive processes
Also there is nice real time graph.
Press Show Panel button to start system monitoring. You can drag window over the screen or double tap to open settings.

Tips:
To start/stop using panel, press Show/Hide Panel button in the options window.
Double-click on the panel opens the settings window.
Select the graph in the "Show Graph" that you want to display on top.
Customize the appearance of the panel using color picker dialogs. Also you can adjust transparency and size of the panel in Sliders section.
If you want the panel did not receive touch events, just select the "ICS hack" box. If you Android 4.0 user, you also may want to turn it on. Since in ICS the status bar is drawn on top of all. Even on top of Cool Tool:)
Tons of gauges could drain your battery very quickly. Uncheck the features that you do not need. Btw, Cool Tool went to sleep and do not draw anything when your display turns off. It is for powersave.
Max Network Bandwidth value is for visual limit on your gauges only. It's don't limit your bandwidth physically.
Calculation of network traffic is considered only for the time since system boot (and it's work only in 2.2+). For longer-term calculations you can use some other apps from market.
Warning! "Show most resource-intensive process" feature is pretty resource-intensive :) and it's required Busybox installed. You should use it only if you really need it.

ps: btw, if you want to localize app into your native language, let me know.

Screenshots: 

Video: