See the series of articles on the topic over at ForbesWoman ~ Why Every Woman Should Ask for a Raise this Year; and, Why We Women Fail to Ask for Raises and What Happens When We Do, most of which is also applicable to men.  Excerpt from the first article below:

You deserve a raise this year because you are working harder, longer and faster than you were before the recession. And as msnbc reported in 2009, you are doing so for less, not more, money.

 That means you are not only doing your own job, you’re also doing the jobs your laid off colleagues were doing. You’ll be difficult to replace because of that. Not only because John and Mary’s jobs are not in your historic employment description, but because fewer people will want to take on the work you’re doing now for the salary you’re now being paid.

 Your employer may need to hire two people to replace you. He or she will also have to incur the expense of hiring one or more new employees.

 You are more valuable than you believe yourself to be. You therefore have more bargaining strength than you believe yourself to have.

How to ask for a raise over at She Negotiates tomorrow.