The W3C co-chair got up on his soap box last week and declared that WebKits power is causing an Open Web crisis:
W3C co-chair: Apple, Google power causing Open Web crisis

Cross-Origin Resource Sharing (CORS) enables you to do AJAX requests across different domains, over on the IE blog they have a nice post about how you can use it in IE10:
CORS for XHR in IE10

If you want to do MVVM in HTML then you might want to check out this post from John Papa that talks about 2 JavaScript DataBinding Libraries.
2 Great JavaScript Data-Binding Libraries

The post above talks about Knockout.js, a few months back I wrote a tutorial on how you could use Knockout.js and MVC together to build a shopping cart you can check it out here:
A Knockout.js price calculator