Here are a few things to keep in mind if you're considering asking out a co-worker.
1. Check your corporate policy. Is dating a co-worker prohibited altogether? If so, you are jeopardizing your job. Other companies have policies that allow co-workers to date as long as both parties sign a "Relationship Agreement" release to abdicate liability.
2. Take it outside. Try to organize a group outing or event, and invite the co-worker you're interested in. If she accepts, you're already a step in the right direction. If not, it's time to rethink the entire thing. If she isn't interested in hot wings after work with the gang, chances are she's even less inclined toward dinner for two.
3. Ask only once. If you do hit it off outside work, now is the time to venture an offer for a one-on-one outing. Keep the conversation light, and suggest something casual, like dinner or a movie. If he says no, do not ask again later. If he seems a little hesitant, take that as a no-he may not want to hurt your feelings, and may make excuses. Drop the subject, and be glad you can remain friends.
4. Think hard-you still have to work with this person. If things go sour (or go nowhere), you still have to see and interact with her daily. Be prepared for that before you start, and adopt the attitude of maturity.
5. Choose one. If you like one person, that's great. Go for it. If you're planning to systematically ask out every person you work with, you deserve to be fired.
Bear in mind that you're always opening yourself up to harassment suits and even termination. Handle it correctly, however, and workplace dating can lead to great things. I dated a co-worker only once. That man is now my husband.