The Polaroid 600 B&W Instant Film is rated at 640 ASA (ISO), and offers strong contrast and fast development times. I like the detail that the shadows retain on this film, even in areas that are definitely overexposed.
I enjoy shooting reflections and architecture with black and white films, focusing specifically on hard, straight lines and artificial details. Bright glass looks great on this film, although in future I will pay special attention to darker shades of glass where light does not reflect as strongly.
Be wary of bright areas/objects - think about exposure all across the frame - especially when using your Polaroid camera's onboard flash, or on bright days. My favourite shots are below.