I bought an Asus eee 1000HE for my Hackintosh project.
Before going for the project, I installed a Win7 Ultimate on this netbook.
There are some hardware upgrade too. 
1) Add a 2GB Kingston HyperX Ultra Low Latency sodimm (DDR2 CL3@748MHz) 
2) Add a Kingston SSD+
3) Add a 4GB Sandisk Extreme Speed Class 10 SDHC as "Readyboost"

I overclock it too.

Surprisingly it's very smooth in watching mkv / H.264 movies.
I use PureCodec.
Here's my setting for smooth HD movie watching
a) Pure codec setting - H.264 Video decoder --> Cyberlink
b) In KMPlayer - Video (advance) ---> Superspeed mode

P/S
My Kingston HyperX Ultra Low Latency sodimm is a 4GB kit (2x2GB)
I have only used one module. I would like to sell my other module.
Those who like to boost the performance of their netbook can PM me for the price of the ultra low latency memory module. 

One word for netbook, it can run pretty smooth too.