I suppose you're not allowed to use Flash/Flex? For non-Flash, moderately rich UI, I'm pretty happy with some of the YUI (Yahoo User Interface) widgets and libraries.
You might also consider GWT. If you know that you're building a big fat (rich) client, it might be worth having a comprehensive IDE with debugging goodness that GWT offers. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.

