Wubi is not a "real" dual boot... It just creates an option during Windows startup -- Wubi os ONLY an installed app that can be uninstalled and reinstalled as much as you'd like (and does nothing to your hard drive).

It runs as fast as a dedicated Ubuntu Linux machine (and much faster than VMWare) and it's been very stable for me for months.

And, yes, the Tablet Flasher app works under Wubi.

-T.