Got a new touchscreen Windows 8.1 PC (an Acer Aspire S7 392) and I just wanted to mention that Skritter works great on it.
You just have to know to use the link that makes Skritter act like it's on an Android, one of these two:
http://www.skritter.com/study/all?android=true
http://www.skritter.com/study/all?android=true&resolution_width=1024
I figured that out with a little bit of searching through the forum, especially this discussion:
http://www.skritter.com/forum/topic?id=739066510
Pretty neat! Yay Flash :)