My girlfriend got her car nicked after she left the door open and the keys in the ignition, she only went to work for half an hour cos she got distracted....
my ex left my door open on my car when we went into a shop to get something, was in a really rough area too.
£500 phone was on my seat (fallen out of my pocket as i got out)
£200+ head unit (which wasnt secured in properly at the time, you had to hold it in if you put your foot down

)
satnav
2 ipods
and a bank card
lukily non got niked, theif could have had a feild day though
