Like others have said, shower before you leave, baby wipes when you get there, and a complete change of clothes. Wool is awesome in the winter, I rode in the same shirt (smartwool mid-weight long sleeve) for a week at a time and it didn't pick up odors at all. I've been wearing assorted old cotton t-shirts since it's been warmer and they're fine for a round-trip (and I have a big pile of them, so don't have to go buy bike-specific whatever).

I'm thinking about cutting my hair off this summer, it's long now and as it gets warmer/humid-er it's getting kind of sticky, but I work in a research lab so the semi-damp pony tail is workable for now.

Also, keep an extra set of underwear/bra/etc at work if you can....learned that one the hard way.... And if you carry your lunch, put it in something really leak proof...

I also usually cruise on the way to work (11mi) and push it more on the way home--if I ride hard both ways everyday I get burned out pretty fast.