The MSI wind U100 is the greatest netbook there is. You can make it faster for about 20% compared to the average netbook.
You have to use the correct ram to get the overclocking to run stable. Use 800 MHZ capable ram that has cas/ras times of 126.96.36.199 on 600 MHZ.
I use my MSI Wind for a year now on Windows Vista and runs swift and stable, No problem ever.
I have Asus netbooks too but the Wind is my favourite.