An awesome hosted e-commerce platform written in Ruby on Rails.  They support OpenIDs for all authentication.

A resource site for web developers using Ruby on Rails -- home of the Rails plugin directory.

Rails Application: Chatlino. It's an OpenID-based Chatroom application. Please download Chatlino from Chatlino Google code project page, and give it a try.

A forum for getting help with Rails that rewards those that are helpful.

Reference Implementation of the open source Alumni Social Networking Platform "Alumni on Rails". http://www.alumnionrails.net

Tech blog that gives tips and articles around Ruby on Rails and .NET uses OpenID for the commenting system.

NinjaID provides you with an OPENID user account, removing the need to remember multiple user names and passwords. With your NinjaID, now you have an easier and more secure way to log in.

Ninja AccessCounter is a high quality, free service to display a counter on your website. It offers rich designs and easy operation.

Ninja WebSite provides users access to homepage space for free.  Despite being a free service, users are able to use unlimited server space and choose unique domains.

Ninjalyzer is a free access analytics service originally developed and run exclusively in Japan, with over 1.7 million users, and now being released internationally.