You should have first defined what "Remote" means.
A company could be willing to hire remote, but to them remote could mean somebody within the area who can drop by the office from time to time.
Still, I am very impressed by your efforts.
Employers - please take this in count in HN Who is Hiring threads as well.
I did ask a few details about how they accommodated remote work (most had teams on IRC, Slack, or Hipchat and only one said they used Jabber) but I didn't standardize as much so I didn't write down all that data. I only had about 2 hours to collect all this so I had to make some sacrifices somewhere. As it was I missed a couple of companies that folded their tables up before I could get to them.
You could collect the data through some hosted form from all the companies at the same time.