Skype

Sites like Skype and Delicious allow people to talk to eachother through their computers and each person is able to see the other person on the screen. This technology can work for people across the hall or across the world. I would imagine that this particularly useful for family members or spouses that are separated for some reason or another. Skype and Delicious are another step closer to actually being with the person, rather than the phone or internet, because there is a visual image of the person on the screen. They are also beneficial because they are a lot less expensive than some of the alternative devices such as webcams.
I haven't ever had a reason to use a website like this, but I also know how it feels to miss someone far away so I realize how nice it is just to see the face of the one you love.
I don't see using these site in the classroom too frequently, but it would be helpful if a student was away for an extended period of time and it could be used he/she wanted to talk to his/her classmates.