I would get a ulock ( key ) have it run through your frame and rear tire and have a cable run to your front tire and around your ulock. If you have 10$ you can get a cheap cable to keep wrapped around your saddle.

Remember NOTHING will stop bike thieves, all we can do is slow them down.

I agree with Scott about the cable locks. I actually use both. I wrap a thick cable lock around my rear wheel, through my seat and then through the front wheel and then lock it using a strong u-lock which goes around the frame.

I've heard that long u-locks are bad because it gives thieves more options when they are trying to pry it open.

http://tpdinternet.tucsonaz.gov/Reporting/

When they recover bikes, which they do find hundreds every year, they will compare the serial numbers on the bikes to their database. If they have a match, you can get your bike back. If they don't have a match after a few months of no one claiming the recovered bikes, the bikes go to auction.

http://www.publicsurplus.com/sms/all,az/browse/…