A pack-n-play or other portable crib: If you have the space and plan to bring the baby to work regularly, this is essential. A close-to-newborn will sleep much of the day, and while she won't weigh a lot and you can certainly get a lot done with her sleeping in your lap or over your shoulder or even in a sling, it's also helpful to have both hands free occasionally. Plus, many models have a diaper-changing tray, which is also handy not only for the advertised purpose but for storing the nursing pillow. Plus, if you think you'll be bringing the baby to work even after she outgrows the bassinette layer and the diaper tray, it's nice to have a secure place for the toddler to sleep (the Working Baby is a thrasher, and we worry about what will happen when she outgrows her crib at home, because there's no way she's not going to roll right out of a bed). Also it doubles as baby jail, and every so often it's good to be able to keep the baby out of something that's going on in the office--if there's a reason to sort piles of paper on the floor or something else temporary but fragile. 

Anyway, the model I have is navy-and-white, very subtle. It also had a sort of sunshade/umbrella thing that might help some babies calm down, or at least it blocks some of the light, and there was a little vibrating doohickey that connected to the bassinette, to which the Working Baby seemed mostly indifferent. We're down to the play yard section only now: once Working Baby has developed the upper arm strength to hoist herself out, I think we'll turn the padded floor into a nap mat (it folds up nicely for when she's not using it).

These look comparable:

from Graco, this model, which lacks the sunshade.

Also this model, with the sunshade.

Or, if you know you'll be limiting the baby's time at work to infancy, and space is at a premium, you might go with a Moses basket. Most of these are long and narrow and have soft but not too puffy linings. I never had a reason to have one, but I love the idea (though I think the temptation to store stuff in the basket would be overwhelming, and then it wouldn't be much use for holding the baby). For those in larger office who might have (or want) to move a sleeping baby--to a meeting down the hall, for example--a Moses basket would be ideal. Plus, talk about low-profile for the office--you could shove the kid under your desk, and no one would ever know it was there!

Here are some good options:

from babybeemine, which also sells old-timey wooden high chairs. 

or, if you're trying to impress, posh tots has fabulous baskets in a variety of patterns and styles (at a variety of not-so-fabulous prices).