buddy of mine had his car keyed 3 times in one month so he got pissed off and set up video cameras facing his 2 car parks, and the doors and windows on ground level, about a month later (a few days after oct 31) the same douche bag threw a pumpkin at his car, took out the windshield, driver side window, driver side mirror, and put a huge dent in the door and bent the bracket the mirror mounts to. Called the police and they said they couldn't do much as there were no witnesses, he gave them the tape, the guy was arrested that week, and my buddy got his car repaired and had the kid chriminally charged for damages and clean up, and lost pay due to having to take a few days off work to get a windshield installed and side window installed, after a new door was put on, and painted. The cameras paid for themselves that one time, and since his house in on a corner, and he has a walk out bastment, with no fence around half the back yard (including one car park), the cameras have paid off more then once. It only cost him about $750 for 5 cameras and having them wired into the recorder (he did the work himself with his father). Might be worth a better investment then a car alarm, I've noticed with car alarms most people just look and look away, or just don't even bother with it, if you get them on film, thats a different story.
Side note, I live in a nice area, not to posh, but its better then a lot of areas in Calgary. There have been two houses on our street that hasn't been broken into, ours, and one other small house a few doors down. Our house and the other are both small houses, and in a large house area, the small houses are just left alone, that, and when theres a shitty looking Dakota sitting in front of it, it kind of deters theft, even more when its left unlocked most of the time. I do agree with the "kids not having anything better to do" part of things. For "kids" in our area, there are two main ages 19-21, and 13-16, just how people had kids in our are, odd, I know. Generally the kids that cause the most problems I have found hasn't been the "poor" kids, but the "rich" kids that have everything paid for. They don't work for anything and have everything given to them. They don't know what its like to earn anything. I'm proud to say I'm 20, and have been saving my money for the last 2 years, and I have saved up $25k, on top of $10-15k in tools. I'm better off then all these little rich bitches who drive the BMW and Mercedes that Mommy and Daddy bought for them when they got their license. I worked my ass off to get where I am now, and I worked my ass off to pay for my first car and the insurance and everything that went with it. It was a 1987 Plymouth Caravelle and I got made fun of for it by these kids, and now most of them are moving out with their McDonalds and Berger King jobs and can't afford the rent and I just sit back and laugh. Ok, I'm now way off topic, but ya, sorry to hear about the books and notes, the books are the cheap part, its the notes that are hard to replace. But like what was said, I'd look for a car alarm, motion sensor lights, or a video (with night vision feature) or something to help prevent this from happening again.