Free Chrome extension / web app allows you to instantly share your computer screen, specific browser tab or application with anyone in a matter of seconds. The other party does not need to install, register or login to see your screen. He only needs to go to the URL you will provide him with.
Key basic features:
100% free for individual use.
Pricing info: http://crankwheel.com/pricing/
My comment: The best solution I am aware of to start an individual screen-sharing session with the minimum fuss and the best possible results.
Try it out now: http://crankwheel.com/
Chrome extension: https://chrome.google.com/webstore/detail/crankwheel-screen-sharing/dooinopjfnhlmmdkdepajfipfhlcmjgp