I have been using Hamachi for years. Hamachi is a virtual private network software (VPN).
The software allows me to securely communicate with the servers in my home or office. Finally Hamachi2 has been released. It has a new interface and the real improvement is the addition of web-based VPN management. With the new web-based management you can create networks on demand through your LogMeIn account. Inviting people is just as simple, you just need to plug in their email address and a link will be sent to them.
Now just waiting for a new improved Mac version of the software.