Back in the nineties I used to have a parttime job as a webdesigner. I worked in a large room with about 6 men (boys, really) who spent a lot of time surfing porn sites and actually discussing them while I was there. Sometimes account managers would enter the room with a technology related question, and they never ever asked me for help, even if the boys didn’t know the answer.
This was a bad time.
Fortunely, now I have my own company my clients do take me seriously.
I agree that women in IT should be more visible, especially ‘cause we’re still a minority.