What are best Instant On OS options right now? Linux or not

[crashnburn]

What are the best Instant On OS options right now? Linux or Non Linux

Previous thread that was closed and I was asked to restart a new thread

Best Linux distro for "instant on"

My googling finds me some quick candidates:

Splashtop
Presto
Linpus Quick OS
Android (x86 port)

Any people with experiences on these?

PS: I like the Linpus Quick OS marketing video which shows instant on functionality with Internet/ Browser, Email Client & Calendar functionality.
Linpus Quick OS Intro

Firstly, Linpus has now shortened boot-up time to 3 seconds totally independent of BIOS - Unlike many of its competitors Linpus’ fast boot solution is completely independent of the BIOS and doesn’t need any fine-tuning or involve any extra hardware costs to the manufacturer.

http://www.linpus.com/news/2009/09/15.html

Secondly, it has a number of applications to make it easier for you to access important Windows information in a hurry. PIM Sync and Folder Sync applications were created to help the sharing of key information between the two systems. In the case of PIM Sync, it copies your email and calendar information from Outlook and shows you a copy in QuickOS saving you valuable time in which you would be waiting for your device to start up. In the case of Folder Sync you can copy important files, music and videos from Windows to Linpus QuickOS.

Also I read somewhere that a certain Instant On OS could be functional in the foreground and BOOT Windows / other OS in the background and then relinquish/ switch to the main OS as/ when the user chooses.

This would be amazing.