Take a look at a British magazine called "Cyling Plus" It is available here in the states at a book store called "Borders". Every year they run a lock review. It is almost disgusting how quickly they can defeat some of those cheaper locks. usually it is the better locks like Kryptonite that stand up really well. Master lock's street cuffs did well too. Not sure when the next lock article will run, or when the last article was. But maybe someone on here will have a copy that they would be willing to copy or scan the article for you.

Sheldon Brown's website has a good article on locking strategy that is worth a read.

As someone mentioned above, all you're trying to do is convince a would be thief that someone Else's bike would be an easier target than yours. Damned shame, but true.