To follow up on this and what Steve's mentioned elsehwere, the locaation stuff is a prime example of the kind of thing we have in mind for future developments where we feel other sites lack.
Right now though this is just a minimal feature set. At midnight last night when I looked at 'add filtering to the search options' on my todo list I decided that with only a handful of jobs on launch day, this can wait. I guarantee though there will be better search filtering by the time the number of jobs has grown enough to warrant that.