Motion Activated Indoor Alert ( model 6019 ). I have one of these installed above the garage door and it works well. The outdoor sensor is weatherproof, is wireless, and has a good adjustable range, so you'll be alerted to the perp well before he gets to the garage door. No wiring - just put batteries in the outdoor unit, set the address, mount it on the garage, and adjust the range. The indoor unit permits incandescent lighting up to 300 watts and has a volume control for the alarm. They didn't have it at Lowes so I bought it at Home Depot. I paid about $35 for the set.
Stealth PIR & Motion Detector 35 mm Game Surveillance Camera available at Walmart. I don't have one of these, but I'm planning to purchase one this weekend (unless I can find something just a bit smaller). It's about $60 on Walmart's website, but I assume it will be available in the sporting goods section at the local store.
I also have two CCD cameras set up (KG-500P1 and KG-190SWB) and connected to VCR's. Unfortunately, I don't have motion detectors on the cameras.
Be sure to set one to get the license number on their car.