Hi! Just so you know I'll be responding to any comments here on HN. I've worked on Vagrant for over 2 years and even originally announced it on HN (http://news.ycombinator.com/item?id=1175901). Over the 2 years of the existence of the project, popularity has steadily rose, features were flushed out, and stability soon followed. With the 1.0 release I'm happy to announce a handful of the many companies who use Vagrant every day as well as present the world with a stable product.
We are using it since 0.3 and am really impressed on how well it worked. I especially enjoyed how well your beta versioning worked: it broke every 0.1, but only in small increments, so keeping up was simple.
Thanks!