* http://digitalocean.com (not docker-specific but they have a great docker image)
* http://rackspace.com (not docker-specific but they have a great docker image)
EDIT: sorted alphabetically to keep everyone happy :)
Early members of that "seed" community included engineers from Twilio, Heroku, Soundcloud, Koding, Google, Meteor, RethinkDB, Mailgun, as well as the current members of the Flynn project.
There are also several startups currently raising money for a business based on docker. This is bigger than any one company!
We had very little adult supervision.
Being too early can kill you. If you think your idea is awesome but too early, my advice is to keep trying for as long as it takes. Docker was not my first attempt at solving this particular problem :) [1] [2] [3]
[1] https://bitbucket.org/Foi3GraS/dotcloud-fork/commits/1
[2] https://github.com/dotcloud/cloudlets/commit/0af885a5266fba7...
[3] https://bitbucket.org/dotcloud/vm2vm/commits/2a34438989fbff0...
Things that impressed me:
1. super passionate
2. he was very receptive and quick at squashing bugs I reported (real or not)
3. docker was super portable (the same across all linux distros)
4. they (the docker team) had real solutions for the long application deployment times that were plaguing me
Everyone seemed to know it would succeed, which is rare around here.
I got to meet the docker team (a lot of french dudes in the team!). Very passionate, technically super sharp, and really fun ! They were interested in my point of view and opinion. Plus, there lead dev knows how to party from what i have seen during a meetup !