Are you guys using Notebook Hardware Control?
You can monitor the Temperature of the HD and Processor all in the system tray, its quite neat and very customizable. One of my favourite features is the Battery indicator. It replaces the windows one with a slightly smaller battery and displays the time left underneath, so you can keep an eye on it.
You might also want to check out MobileMeter, which can display similar information as Notebook Hardware Control, but not as advanced. But i do like both, which is why i have them both running, displaying different info.
Link to MobileMeter: Download
In the image above, Mobile meter is on the bottom right of the screen and NHC runs in the system tray! The battery Icon is showing % charged, if you unplug it, it starts to show the actual time left.