Get Source of HTML File with CSS Inline

I'm assuming you've seen the online tools that are available like this one? This online tool (which I have not tested but looks like it works) gives you the option of providing a url or source code and shows warnings for cross-browser compatibilities with your styles.

I use a tool that does something like that, but it was written for Ruby and TextMate for Mac. It is released by Campaign Monitor as a way of preparing HTML emails. It brings all the rules from the stylesheet and makes them inline styles.

It might give you a good start. I'll keep looking.

TextMate Email Bundle

The piece that does the heavy lifting is the TamTam RubyGem which brings the CSS inline. However, it seems to only support one style element (not link elements). If you could work with those restrictions, you could get it to work on Windows using Ruby and a ruby script file. Not quite drag and drop I'm afraid.