In order to not derail my talk, the following are some experiences I've had
working in technology over the past decade.

In my career, most of the resistance has been subtle, but persistant:

People assume (or insist!) I'm a secretary, and want to talk to a "real
developer"

I had difficulty getting a mentor (particularly early in my career), ended up
joining women in tech organizations to find one

I was once reminded by everyone on an interview panel that I'm a woman, and
would be the first one the team (pro tip: it's worthy of note, but having
everyone repeat it was a bit troubling, and ended up being an indicator of
toxic work environment)

Have been exposed to companies expressing "poor culture fit" as reason why they
don't hire women for their technical teams

Want your engineers to have open source experience? The open source world can
be much worse:

Debian death threats (I received one):
http://www.theregister.co.uk/2008/07/03/debian_death_threats/

Public sharing of my home address and phone number to shame/expose me after
running a competition supporting girls using Ubuntu

Frequent comments on looks, age and marital status

Explicit sexual public comments on IRC and Twitter following the hosting of a
Linux installfest

Any failure to succeed ascribed to lack of merit rather than taking into
account the complex social and political structures that exist in all software
projects (the fallacy of the "meritocracy")

Interesting perspective that may help those in the majority understand: "Is
This What It's Like For Women At Every Conference? Experiencing Grace Hopper as
an interloper by Jamie Talbot" -
https://medium.com/grace-hopper-2013/17d1a8607199

Full talk slides here:
http://princessleia.com/presentations/LOPSA-East-2014-Keynote-ekjoseph.pdf