Show temperature in your device's notification bar.
TempMonitor Lite:
* Battery Temp Notification
* Black or White Notification
* Start on Boot
* CPU Temp in App Screen (requires kernel support)
* Bat Temp in App Screen
* 2.3.5 Fix Wake Bug
For CPU temp in status bar and Fahrenheit options among many many other things, check out the full version of TempMonitor.