To the person who got their bike stolen: if you don't need to carry a whole lot of things and don't mind using a backpack. Get a folding bike and bring it everywhere you go. Something like a Strida so you can roll it everywhere even when folded. A locked bike is just asking for it. In a hot market, it'll get stolen eventually...just a matter of time.

So my way of thinking is to don't tempt the bike thieves with your nice nice bikes, but if you do have to haul crap and absolutely need to use a regular non folding bike, use a beater...afterall, this is just commuting...no need for uber light bikes for commuting...leave your nice bike safe and sound at home fortified like fort knox.