Yea when I am obsessed with a car I download as many pictures of it as possible, and learn as much about it as possible. I have over 1,500 car pictures saved on my hard drive.
Often times I go as far as buying a diecast model of it and displaying it on my self (I also tend to take a lot of pictures of it). 1:18th scale models really are a fun thing to collect for any car enthusiast. You can find pretty much any popular car in 1:18th scale (the size thats about 7-9 inches long), as well as a lot of not so popular cars. I buy all mine on ebay; most new ones are 25-30, some up to 70 or higher depending on the brand. AutoART is the best, and offer a very wide variety of car manufacturers. You can get used/open ones still in good shape for really cheap though. It's a good way to take your "dream garage" to the next step.
Another way I cope with car obsession is to play a game like Grand Turismo, Need for Speed Underground, Forza Motorsports, or any game that allows modding (and includes your desired car, of course) and mod the car to how I would have it in real life. I also do a bit of 3D modeling (
www.toddfx.com if you're interested in my gallery), and sometimes model the car or find a model of it and modify it to how i'd like it.