I've been spending my remaining FP-3000b (14 or so packs left?) documenting my fourth year engineering project - to make a formula student race car for the competition in Michigan in May. (All of it eventually ends up on my tumblr.
The first two were taken with my Polaroid 250, then the squares were taken with a borrowed Hasselblad 500c with a polaroid back that a lab tech gave me last week.
With the 250, I found it was better to overexpose the negatives than underexpose them; it seems to take alot of exposure before the photos turn out lousy. With the hasselblad on the other hand, I expose for the indicated speed or half a stop over, and there's some bleeding or flare from the highlights, presumably from the glass plate in the polaroid back. For some reason, the highlights tend to blow out easily in the Hasselblad...
The film won't spoil if you pull the photo sandwich and leave it for a few hours, but I found that the contrast is better if you peel within 5 or 10 minutes. Also leaving the sandwich in your pocket for 5 hours can result in a distorted surface of the print.
It's a real shame that they discontinued this film... it's good stuff.