I performed a test to see which boots faster on my stock model Samsung NC10 netbook: Windows XP or Linux. On my NC10 I have two partitions, not counting the Recovery partition. The first partition is the OEM version of XP with SP3. I installed all pending critical updates from Microsoft and AVG Free antivirus. On the second partition I installed Eeebuntu 2, a distro of Ubuntu 8.10 Intrepid Ibex kernel "2.6.21.8 eeepc". My criteria for OS load complete is all icons appearing on the screen and the mouse pointer no longer displaying an hourglass.
On main power
Power on to OS selection screen: 7.66 seconds
OS selection to XP: 1:03.65
OS selection to Linux: 1:08.63
On battery power
Power on to OS selection screen: 8.66 seconds
OS selection to XP: 1:01.91
OS selection to Linux: 1:06.31
Shutdown time on battery power
XP: 35.50 seconds
Linux: 14.03 seconds
Just to compare apples to oranges to rutubagas, I did the same comparison on my Asus Eee PC 900 with XP SP3 and no TSR antivirus (but do have Clamwin installed).
On main power: 1:00.27
On battery power: 1:02.36
Shutdown: 16.02 seconds
I do plan on replacing Eeebuntu with Easy Peasy (formerly known as Ubuntu Eee) when it is released on New Year's Day. Eeebuntu works, except I can't increase or decrease the screen brightness. We'll see if Easy Peasy resolves that issue.