There are a couple of glass presets in the Material Swatches section of the setup window. It's pretty much a case of adjusting the material's transparency setting and Reflectivity setting. There's a couple of really nice tutorials on how to create reflectivity in glass right here on the Cow by Kurt Murphy - one is a cross and the other is a globe.
JD
John Dickinson
Motionworks
http://www.motionworks.com.au