Also helps:
-EeeSuperHybrid engine, an Eeepc utility for overclocking while running Windows. I call it with Fn+Space bar, then I go to its icon on the taskbar (next to the time and antivirus), right mouse click and select Super Performance Mode.
-Configure programms not to open on windows startup. Ares, Messenger, Skype, ...should not start, use them on demand or close them.
-remove startup programms:
http://teamtutorials.com/windows-tutorials/remove-items-from-windows-xp-startup#.T8eoulJhunA
A utility for winxp to disable uneeeded services is the freeware Hijack This, use it with care.
-To disable visual effects (recommended):
http://www.xp-tips.com/disable-visual-effects.html
You can change the win98 theme, I use a changed pumpkin theme.
http://windows.microsoft.com/is-IS/windows-xp/help/setup/personalize-windows-xp
-For moving virtual memory to the sd card:
http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/sysdm_advancd_perform_change_vmpagefile.mspx?mfr=true
I left virtual memory only on the sd card, Eeepc internal disks are too slow.
You can disable Windows services (with care):
-http://www.jasonn.com/turning_off_unnecessary_services_on_windows_xp
Hide your Windows taskbar, you will have more space.
Do not use gadgets on vista and 7.
Tune your browser, erase every unneded bar, move browser cache to the sd card.
Stop every automatic update, do it by hand and on demand.
Tune by hand, do not use tuning programms, they open at startup and we don´t need them. Leave the Asus programms and the antivirus alone, they do should start .
The key of the Eeepc is tuning and using an sd card for virtual memory. If you tuned the right way and searched for the highest performance then you surely can enjoy this youtube movie:
http://www.youtube.com/watch?v=jUUXdpuhWfA
Good luck