A friend says Netbook can’t play HD video from Youtube or his BT download. Maybe he is wrong.
I found a great software which allows you to overclock the graphic card of your Netbook. Once you overclock your Netbook to 250MHz, you should be able to play the HD video smoothly.
Windows version download here
Linux version download here
Mac version download here
Please make sure your Netbook is using Intel GMA 950 graphic chip. Overclocking to 250Mhz should be able to get more than what you need. Use it at your own risk! If you burn your Netbook, I may not be able to help you.
NOTE: Overclocking your graphic chip may also heat up your Netbook and reduce battery life.