While women cannot do the Y chromosome test themselves, a brother, father, uncle on your father's side etc. can do the test. What the tests do is look at the Y chromosome of MtDNA. These have repeated sequences in which vary from person to person but usually stay the same for several generations. So if you get a match, you're going to be closely related. Each test is done on its own so a man wanting to do both tests would have to pay twice as much, so doing the MtDNA test is still good to do.
At the moment, the tests are very expensive for what they are. Unless you actually know what you're trying to gain by doing it then it's probably not worth it yet.
Andrew
