1: Ctl + Alt + Backspace
2: Ctrl + Alt + Delete
3: Alt + Tab
4: Ctrl + Alt + F*
5: Alt + Arrow key
6: Ctrl + a and Ctrl + e
7: Ctrl + c
8: Ctrl + z
9: Arrow up or Arrow down
10: Ctrl + r
via techrepublic
#1: Disable unnecessary services
#2: Disable unnecessary kernel modules
#3: Use a lightweight window manager instead of GNOME or KDE
#4: Use a text-based login instead of a graphical login
#5: Use a lighter-weight distribution
#6: Use an OpenBIOS
#7: Avoid dhcp
#8: If you can spare it, get rid of hotplug
#9: If you are REALLY daring, you could give initng a try
#10: Use a hack with Debian
via techrepublic