I've always been looking for a service which enables me to look at my CSS changes in real time. As web developers will know it is time consuming and a lot of hassle having to change CSS in one window and then refreshing the html page in another to preview the changes.
WebPutty is a service which now enables you to see your CSS changes in real time. It's a great tool which I know will be invaluable to web developers. It is in BETA stage at the moment so there may be bugs here and there. If you find a bug I advise you to give them feedback about it so they can make the service better and better.