ScreenHero is a downloadable app for Windows and Mac computers that allows you to collaborate one-on-one on the same app with someone else at a distance.
ScreenHero has recently added full support for Windows PCs and it now integrates a voice feature allowing you also to talk with the person you are collaborating with.
Your login credentials and session data are fully encrypted using a P2P TLS scheme (SSL based).
ScreenHero operates as a P2P app, allowing parties to hook up directly to one another, and resorting to its centralized servers only when a direct connection is not possible for some reason.
My comment: An excellent screen-sharing tool for distributed teams. If you regularly operate with someone else at a distance and you need to easily and reliably share screens to see and edit drafts, mock-ups, presentations or code, ScreenHero is a great resource.
N.B.: If you are on a PC you will need a recent version of Windows, as PCs with Vista and earlier Windows versions are not supported.
Free version available.
Find out more: http://screenhero.com/
Download it: http://screenhero.com/download.html