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First, as a mural. For friends here who like to pick at the weave.

 %w[rubygems active_record markaby metaid ostruct].each {|lib| require lib}
 module Camping;module Models;Base = ActiveRecord::Base;end;module Views;end
 Markaby::Builder.class_eval{include Views};module Controllers;module RM
 attr_accessor :input,:cookies,:headers,:body,:status;def method_missing(m,
 *args, &blk);str=eval("markaby.#{m}(*args, &blk)");str=markaview(:layout){
 str}rescue nil;r(200,str.to_s,'Content-Type'=>'text/html');end;def render(m)
 str = markaview(m);str = markaview(:layout){ str }rescue nil;r(200, str,
 "Content-Type" => 'text/html');end;def redirect(*args);c, *args = args;if \
 c.respond_to? :urls;c = c.urls.first;c.gsub!(/\(.+?\)/) do;((a = args.
 shift).respond_to?(:primary_key) ? a.method(a.primary_key) : a).to_s;end
 end;r(302,'','Location' => c);end;def r(s, b, h = {});@status = s;@headers.
 merge!(h);@body = b;end;def service(e, m, a);@status, @headers = 200,
 {'Content-Type' => 'text/html'};@cookies=Camping.cookie_parse(e['COOKIE']||
 e['HTTP_COOKIE']);cook = @cookies.marshal_dump.dup;if (e['REQUEST_METHOD']==
 'POST')and %r|\Amultipart/form-data.*boundary=\"?.+?\"?|n=~e['CONTENT_TYPE']
 return r(500, "Urgh, multipart/form-data not yet supported.");else;@input =
 Camping.qs_parse(e['REQUEST_METHOD']!="POST" ? e['QUERY_STRING'] : $stdin.
 read(e['CONTENT_LENGTH'].to_i));end;@body = method( m.downcase ).call(*a)
 @headers['Set-Cookie'] = @cookies.marshal_dump.map { |k,v| "#{k}=#{Camping.
 escape(v)}; path=/"if v != cook[k]}.compact;self;end;def to_s;"Status: #{
 @status}\n#{@headers.map{|k,v|v.to_a.map{|v2|"#{k}: #{v2}"}}.flatten.join(
 "\n")}\n\n#{@body}";end;private;def markaby;Markaby::Builder.new( 
 instance_variables.map{|iv|[iv[1..-1].intern, instance_variable_get(iv)] },
 {});end;def markaview(m,*args,&blk);markaby.instance_eval{Views.
 instance_method(m).bind(self).call(*args, &blk); self }.to_s;end;end;class R
 include RM end;class NotFound < R;def get;r(404,h1('Camping Problem!')+h2(
 'Not Found'))end end;class<<< self;def escape(s); s.to_s.gsub(/([^ \
 a-zA-Z0-9_.-]+)/n){'%'+$1.unpack('H2'*$1.size).join('%').upcase}.tr(' ','+')
 end;def unescape(s);s.tr('+',' ').gsub(/((?:%[0-9a-fA-F]{2})+)/n){[$1.delete(
 '%')].pack('H*')}end;def qs_parse(qs,d='&;');OpenStruct.new((qs||'').split(
 /[#{d}] */n).inject({}){|hsh, p|k,v=p.split('=',2).map{|v|unescape(v)};hsh[
 k]=v unless v.empty?;hsh}) end;def cookie_parse(s);c=qs_parse(s,';,') end
 def run;begin;k,a,m=Controllers.D(ENV['PATH_INFO'])+[ENV['REQUEST_METHOD']||
 "GET"];k.class_eval{include Controllers::RM};o=k.new;o.class.class_eval do
 Models.constants.each{|c|g=Models.const_get(c);remove_const c if  
 const_defined? c;const_set c,g};end;puts o.service(ENV, m, a);rescue=>e
 puts Response.new(200){@headers['Content-Type']='text/html';@body=Markaby::
 Builder.new({},{}){h1'Camping Problem!';h2"#{k}.#{m}";h3"#{e.class} \
 #{e.message}:";ul{e.backtrace.each{|bt|li bt}}}.to_s};end end end end

1. gem install camping --source http://code.whytheluckystiff.net/
   • Installs the regular camping.rb.
   • ... and dependencies activerecord, markaby and metaid.
2. For an example, see the blog.