A glide cam is a newer steadicam system which can allow you to get amazingly smooth shots, and the system, for what its worth, is relatively cheap to most other steadicams.
The picture above is of the Glidecam HD-2000. This is the medium priced model. There is a HD-1000, 2000, and 4000 and the difference between each of them is the amount of weight they can hold and the length of each unit. The 1000 can hold about 1-3 pounds which seems very impractical because while lenses and attachments most DSLRs will tip that scale. The 2000 holds about 2-6 pounds more weight and a little cheaper for those who are just beginning with steadicam use. Finally the 4000 can hold up to 10 pounds and extend to 28 inches. Now the HD models are the older brothers to the XR models. If you are looking to save a little bit more money the XR's may be right for you, however getting them to balance is a much more tedious process.
For a more in-depth look at the process visit the link above, it covers a lot of good information especially if you are looking to invest in one of these systems. This on Phillip Blooms website, an independent cinematographer, a lot of useful film tips can be found on this website, I suggest you take a look around.
The person to really get the name of this system out there is Devin Graham. Devin is a Youtube partner who creates some pretty insane videos using DSLRs combined with the glidecam. He films a lot of free running videos ,especially for the video game series Assassins Creed. Using the glidecam in this style of video is really cool because it makes it feel like you are running right with the character the whole time. The video is posted below.
Devin usually posts a Behind the Scenes video which really helps you see how they do all of the unique shots. The link is posted below.
This is another video by Devin which is shot on the Canon 5D Mark II and the Glidecam 4000. The whole video gives you the feeling that you are almost flying.
Now the most expensive model of Glidecam is about 600 dollars with a little bit of hunting around the internet and in reality for a steadicam this is an extremely good deal. Just typing in steadicam to a google search the results show models ranging from 1000 dollars to about 9000, and they can go even high then that. There are also cheaper models but typically in video equipment you get what you pay for and thats quality. Another thing besides price to take into consideration is that steadicams do make your shots look good but you can't just pick it up and expect a beautiful shot, these skills take practice just like anything else. But if you want to start getting some hands on experience with this equipment for a relatively cheap price the glidecam cam could be the piece of equipment for you.