showmypc.com. This is another great tool similar to join.me and screenr.com. As soon you open showmypc.com homepage, they have a crisp feature list.
Remote Access: A service has to be installed in the PC which needs to be controlled and activated. That's it, you can now take control of this machine anywhere. The target machine used to control needs an application which lists all the remote PC you have registered for, beside every remote machine you have "Connect to PC" to connect to the machine.
Private meetings: Customers can provide remote support, remotely access PCs, conduct meetings and demonstrations online. This is more for corporate who provide customer support and have some dedicated server.
Premium meetings: This is same as private meetings without the need of dedicated server, but only protected with a password.