CSSFly lets you edit your websites on the fly. It gives you instantaneous, real time editing in your browser.
Edit your external Style Sheets and XHTML code simply by entering the URL of your website; or use the handy book mark tool to edit the website currently displayed in your browser. CSSFly lets you visualize your edits as you make them–before any changes to the original are made. This way you can avoid changing the original stored on your computer and simply implement changes, or play around with results from within your browser. It’s free to use and no registration is required.
CSSFly.net In Their Own Words
“CSSFly is a web 2.0 tool for easy editing websites direct and in real-time in your browser. Simply edit the (X)HTML-code and the external Style-Sheet files : what you code is what you get! This tool is designed for developers. Use it for developing, testing or checking your web-project or take a look behind the scenerys of your favourite websites.”
Why CSSFly.net It Might Be A Killer
This site comes in handy for those times when you want to make changes to your websites, but aren’t sure exactly what kind—with CSSFly you can spend time tweaking with the results without changing the original until you get something you’re satisfied with.
Some Questions About CSSFly.net
How are they going to monetize this 
