I friend pointed me towards this blog entry about coding on Chromium?
Made for an interesting read. It still wouldn't do the trick for my ASP.NET development but certainly is a step in the right direction. It also pointed me towards Mockingbird?which is a similar mockup product to Balsamiq. It looks fairly cool and seems to be free (I have only had an initial look at work so will find out more later this evening), I have noticed it doesn't have mocking bits for handhelds. It's certainly worth a look if you are a keen wire framer / mock lord.