Reach out to your friends, family and people in your various networks and have them use the product to get honest feedback. If you have people whose feedback you respect, add them into a Trello board and ask them to give you feedback on Trello, so you can track and actually utilize their comments.
Definitely post the website on your LinkedIn as a blog post, so people in your LinkedIn network can see it.
Try to get onto cool podcasts to talk about your product like this one: http://techcrunch.com/2015/07/06/pitch-your-startup-in-the-t...
Best of luck!!
We haven't launched our startup yet, but we are writing about our marketing techniqes and the things we do in order to bring more future beta users.
See our Marketing Hacks here:
http://kilometer.io/community/forum/thread-category/marketin...
and if you find it useful - feel free to share it :)
Try and ask at http://growthtalk.co