Screen sharing is one of the last of the holy grails of true collaborative computing. It's so much easier to show somebody a process as opposed to trying to explain it over the phone. While screen sharing has been free and around forever, going through a complex set of software and network configuration to get it working is a hassle.

Enter CrossLoop, an upstart that has simplified the process and made screen sharing as easy as instant messaging. Zero configuration, no router settings, and a very simple interface for folks a little intimated by this sort of thing.
After selecting whether to "access" or "share" all the user needs to do is hit connect. The host is given an access code to share with the person connecting, and it will only accept connections for two minutes after the connect button is pushed.
CrossLoop uses the open source VNC for the actual screen sharing. Connections are fast and responsive, and each session is encrypted to prevent network snooping.
CrossLoop is free for individual use. They will be monetizing their business by running a matchmaking service that connects those in need of computer help with freelance techies who will assist for a fee. It's an innovative business model that might actually make them profitable. It sure beats calling foreign call centers or having the Geek Squad mangle up your computer.
My only complaint is the lack of Mac support. Given that CrossLoop is built on VNC, which powers Apple's own remote desktop application, I'm sure a Mac version won't be far away.
