In my experience, it's not sweat that smells, but sweat that stays on your body for too long. So baby wipes, reapplying deodorant, etc will all help.

One of the biggest things I've found is to stay away from cotton. A couple posts up mentioned that too. One of the things I've found is you don't have to go and drop $60+ on a bike specific jersey to have cool, lightweight and wicking fabric. I got some generic working out/jogging t-shirts from Target for about $10 each that are made from a spandex and polyester blend. They work amazing, I ride them to school and work. I don't even need to carry a towel or baby wipes, just an extra stick of deodorant.

Sidebar: it seemed like a good idea to wear gym shorts, since they are not cotton. I'm not concerned with aerodynamics, etc, on a commute, so I thought it wouldn't matter. Turns out they will fall back on my legs when my legs are at the top of the revolution (exposing way more leg that I would like, and occasionally showing boxers), and occasionally get caught on the seat clamp/water bottle holder, causing me to slam my leg into the top tube when I attempted to pedal forward. Not fun.