>  In short is Rails a good choice for my solution?  Are there
>  advantages/disadvantages that I haven't considered?
>  
>  I am trying to make good planning decisions early in my small startup
>  before I lose the ability to make changes quickly and easily.

In short, if you could make it scale with PHP, you can make it scale
with Rails. It follows the same principle of Shared Nothing. See more
in the Deployment chapter of the Rails book or search the term on
Google.

We have quite a few setups that does hundreds of thousands of requests
per day. One that'll soon break a million. There's a lot of scaling
going on with Rails.
-- 
David Heinemeier Hansson
http://www.loudthinking.com -- Broadcasting Brain
http://www.basecamphq.com   -- Online project management
http://www.backpackit.com   -- Personal information manager
http://www.rubyonrails.com  -- Web-application framework
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