diff --git a/activesupport/CHANGELOG b/activesupport/CHANGELOG
index e6709f0d3e..40ea411ada 100644
--- a/activesupport/CHANGELOG
+++ b/activesupport/CHANGELOG
@@ -1,5 +1,7 @@
 *SVN*
 
+* Added Extension extension to provide support for clean backtraces. [Nicholas Seckar]
+
 * Updated whiny nil to be more concise and useful. [Nicholas Seckar]
 
 * Added Enumerable#first_match [Nicholas Seckar]
diff --git a/activesupport/lib/active_support/core_ext/exception.rb b/activesupport/lib/active_support/core_ext/exception.rb
new file mode 100644
index 0000000000..323d97aa44
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/exception.rb
@@ -0,0 +1,18 @@
+class Exception
+  
+  alias :clean_message :message
+  
+  TraceSubstitutions = []
+  
+  def clean_backtrace
+    backtrace.collect do |line|
+      TraceSubstitutions.inject(line) do |line, (regexp, sub)|
+        line.gsub regexp, sub
+      end
+    end
+  end
+  
+  def application_backtrace
+    clean_backtrace.reject { |line| line =~ /(vendor|dispatch|ruby|script\/\w+)/ }
+  end
+end
\ No newline at end of file