Join.me

Keeping in the sharing theme lately, another nice free service site is
Join.me, which allows Mac and Windows users to quickly share their screens with each other and work together. To use Join.me you do need to download the Join.me client. Once you've downloaded the client you can start sharing your screen with anyone you like. Just give your nine digit access number to your collaborators to give them access to your screen and to converse with you.