It would be cool to get an embedded version of Webkit in Sublime for a few reasons.
1, A live preview would be nice. I know a lot of people are very tied to it. I don’t need this all the time, but sometimes it is handy.
2, Enhanced, form based tools. Here’s where I think getting an embedded version of Webkit would really make Sublime shine. Building out a form based plugin which could have validation, if/then logic, etc. For example, some CSS3 gradient tools would be great and have it paste the code directly in the editor when you’re done. Having the option to run the files local or online would be good too. We could build out a “sublimeaddons.com” which hosted multiple “tools” which users could build on and quickly get within sublime.