I have been using OpenID now for a year or so. It’s really good/useful because it lets you have a single identity across multiple websites, which massively simplifies the login and register procedure and also makes me feel warm and safe that this data is held centrally by ONE trusted company. Not having to worry about whether I will trust a site encourages me to sign up.
The problem I have is that not every site supports OpenID 
In fact very few do, and those that do tend to be a bit geeky!
It would be a real shame if OpenID was thrown on the pile marked “geekdom” and didn’t make it into the mainstream.