Build an application over a series of screencasts, like a shopping cart, or forum, with several features, and address problems as you go (try to have it unprepared so we see the thought process behind writing an app).

how to write helpers to manage multi models forms easily (perhaps from complex forms railscats) to manage properly foreign keys included polymorphic associations

Than you so much

It appears that you are using many advanced features of TextMate and a show detailing how TextMate helps you in a Rails development environment by showing shortcuts and various other language features that it offers.

A railscasts on the best way to setup tabbed navigation at both a application level (ie.. Home, Search, Reports..) and at a model level (ie.. Person - Main info for person, associated pictures, reviews, etc). Also include full crud operations in tabbed setup vs. just a read only setup.

http://apotomo.de/

A framework to use object-oriented widgets instead of a flood of confusing partials. The best thing: The widgets are stateful! Niiiice!

It would be cool to see a railscast episode on giving users a rich text entry system (With the usual bold, italic etc options), and to see how rails could be used to convert their input into html or textile to store within the database.

Can you do an epissode on how to validate models created via ajax requests?

Thanks,
Catalin
me@talin.ro

I think you should do an episode on HAML and all its markup beauty.

Maybe a series of screencasts showing how to configure mongrel to work with apache (among other variations) for a live deployment eg www.myrailssite.com.

Also as an example, maybe how to set up a development subdomain for a mongrel running in dev mode. eg dev.myrailssite.com

What are the best practices and uses for Rails Cells?

http://cells.rubyforge.org/

i'd like to see a railscast on using http://rubyreports.org/

The basic concept how rails and a web framworks in ruby works. Where does it start? how do it get the request? etc

Please continue the PayPal and ActiveMerchant series with an episode on recurring billing for subscriptions.

It's a gem for Google maps and Rails 3. Available on github: https://github.com/apneadiving/Google-Maps-for-Rails

Many user registration forms on the Web don't fit on one page. There might be login info on one page, a billing info page on the next, and a credit card detail page depending on what they had answered in a previous form. What is the best way to create these multistep forms in rails? Is it possible to maintain RESTful naming conventions? Should the data be split into many models or kept as one? Basically, any guidance would be appreciated. Thank you.

"Every first Thursday in a month". There are a some plugins and gems (Runt, acts_as_calender, recurring.rubyforge.org and some more) to handle this. Show how to use them and give some recommendations.

How to create a RESTful controller for polymorphic models like tags/taggings, which can be related to many different models. EG /photos/tags, /users/tags, /locations/tags, etc... I am using the acts_as_taggable_on plugin for creating contextual tags, and have implemented a solution, but I think it could be cleaner.

How about an episode or few, on scaling of Rails projects? It can come quite handy when your project grows up with time.
How to get up and running production server using Apache+Mongrel, or mod_rails, what should be in check list, tips and advices, what to use to deploy prod server, update files from dev to prod, backuping, and other automation. As a bonus, it would be nice to read any advices on average server configurations, what to use, what to not.

Since passenger seems to be what the cool kids are using for rails hosting these days, a quick run-through of setting it up followed by how to deploy and restart the app with capistrano would be very useful.

go over making a public web services api that you can use with adobe air or other applications using with or without authentication. This i think is a must cover topic.