Dick Davies wrote:
> Why would you use this rather than Warbler (for example)?

Because it is really simple to use. You can create a simple webapp to do 
an addition x+y with just one line of codes:

------------add.rb--------------------
ctx.print(ctx.getParam('x').to_f + ctx.getParam('y').to_f)
--------------------------------------

------------add.erb--------------------
<%= ctx.getParam('x').to_f + ctx.getParam('y').to_f %>
---------------------------------------

then invoke it by
    http://..../add.rb?x=2&y=3
    http://..../add.erb?x=2&y=3

I just added these two examples on 
http://services.tudbc.com/tudbc/TudbcJRubyServletDemo/demo/demo.html

You can try it yourself.

All you need to do is to create the .rb or .erb files. And you're ready 
to go. No more setup, no more warbler, or deploying.
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