I was able to boost my netbooks performance by editing the bios settings and power settings of windows. I set the bios to the non-green setting of maximum performance so that the CPU is always 1.66Ghz on my Atom CPU and under windows power management, I set the netbook up to be power hungry. Maximum performance setting for CPU and the only thing I did set up to get about an hour more of battery life is to set the display brightness down from max brightness. I have the Toshiba NB205 netbook. *The other thing that improved performance and battery life was replacing the slow 5400rpm 160GB HDD with a 90GB OCZ Agility 3 SSD.
My netbook runs Windows XP Home SP3 on 1GB RAM. Back when I bought it, there was an option for Windows XP Home or Windows 7 Starter edition. I figured the Windows XP Home would run far better on this Atom CPU. The bechmark of this Atom CPU places it equivilant to a Pentium 4 2.53Ghz in Passmark score. The one area that it is extremely weak is with its GPU such as trying to watch Netflix etc it struggles badly on full screen, but runs ok on non-full screen. It also plays Diablo 2 pretty good, but is crippled by newer games like Torchlight 2 as my last plane trip taught me after downloading it through steam to my laptop from airport wifi to play offline at 32,000 ft vs Diablo 2. The Integrated GPU is about as powerful as a Geforce 2 when benchmarked, which is not very powerful in todays computing hardware specs!
Regarding the Atom CPU, I have always been curious as to how it would perform in a mini ITX board with a single PCIe 16x slot and a good video card, BUT I wouldnt buy another Atom CPU system. According to benchmark figures it should run similar to a Pentium 4 2.53Ghz in CPU power, so if paired up with say a GeForce 9800GT video card, you might actually be able to play not too heavy of CPU demand, but heavy GPU demand games on it without lag.
Surprisingly there are servers out there that run the Atom CPU's, but they must not be good for anything but simple tasks like file servers, DHCP, Domain Controller, etc. I definitely wouldnt have it as a server for running a database etc with multiple users tapped into its use.