Being a comp. geek isn't an easy life style, especially if you also have the itch to solve problems. Sometimes, you just wish you had total control on the device that you are troubleshooting or atleast see what your friend/user at the other end is seeing. Its not very often that supply meets demand or the demand meets supply, but we've got a good case here. Our demand is for a free tool to control or see the remote machine. Here are two which are free, atleast currently.
This one lets you control the machine. Control of a device gets very sensitive when it comes to its security, so here is a whitepaper for this technology; decide it for yourself. Check page 7 & 8 for some visual explanation. It does use SSL/TLS.
This one lets you see the live screen