Do remember that the polarizer will prevent up to two stops of light from entering your lens. If you use this to remove the reflections from interior exhibits, I doubt if you'll be able to get a fast enough shutter speed to freeze action, let alone to handhold, unless you want to setup a tripod and don't mind shooting subjects which are less inclined to move eg. snakes, big insects.
As Solarii mentioned, move your lens closer to the glass to cut off reflections, and adjust the angle of the lens to the glass as necessary to minimise the effect of reflections in your image. However you'll need a lens with quite a close focusing distance, otherwise you might be too close to the subject to get a focus.
Yup...with all SLR and DSLR and all P&S that lets you compose your shot via the LCD monitor and the image is taken directly off the zoom lens and NOT the tiny auxillary viewfinder that you see in some P&S cameras at the top left corner.
heheh I was also abit puzzle why he wrote that or maybe he knows this guy and his camera works in that manner.