well the ac power thing on my notebook burned up last night.
I found out I had the choice of ordering one from Dell for about $65, driving to Best Buy and getting a different brand over $100 plus whatever else I'd buy at Best Buy because I always find something in there to buy, or ordering an OEM replacement from an online store $30.
I'd really like to go to Best Buy and get one today, but I decided to use the desktop for a couple of days and stay out of the stores.
Don't get the 3rd party adapters that you can buy at Best Buy or Circuit City for Dells. Most recent Dell laptops have a special circuit in them that detects if it is a Dell OEM adapter or an aftermarket one. If it is not the official adapter, then it will run the laptop, but will not charge the battery (it puts a warning up on screen when you connect the other AC adapter).
The packaging on the Targus and Kingston adapters doesn't explain this well.