Technically I have a bottle of women's multi-vitamins. Like one poster said they are probably a waste if you have a balanced diet. However that is an big if considering the amount of crap many people (particularly many Americans) put in their mouth. If you don't get enough of certain items or if you are exercising a lot a multi-vitamin can be quite helpful.
If you only need one or two vitamins/minerals then it would be better to take those separately than to take something that is going to 'O.D.' (literally or figuratively) on another vitamin/mineral. I take Green Tea tablets regularly (for polyphenols) and CO-Q10 (when I can afford it).