I recently developed www.RailsOrFAILs.com a remote Rails footprinting[1] 
application. If you enter a URL there it will look for typical Rails 
conventions used (e.g. used paths/URLs, HTTP headers etc.) and rate the 
results. The app provides instant feedback to users who are curious 
about a site's used framework ("do they use rails or not?") but also 
collects tested urls in a database.
The project goal in the future is to have an up-to-date references list 
of cool Rails apps in the wild that everyone can access and extend 
(maybe through comments, twitter, "claim your site/tech details from the 
author").
But as you can see the current "screen design" horribly sucks or rather 
is no existant...
Is someone here maybe interested in helping me out? (Logo, ScreeDesign/UI))?
be warned: The only deal I can offer in exchange is to promote your 
website/brand on RailsOrFAILs.com or some rails development time.
best regards from Munich,
Roland
(rmoriz on freenode - CEST (UTC+2) timezone)