Update versions (otherwise you install a gem from source as beta3 but internally it's beta2) and update CHANGELOG.

actionmailer/lib/action_mailer/version.rb

@@ -3,7 +3,7 @@ module ActionMailer
     MAJOR = 3
     MINOR = 0
     TINY  = 0
-    BUILD = "beta2"
+    BUILD = "beta3"
 
     STRING = [MAJOR, MINOR, TINY, BUILD].join('.')
   end

actionpack/CHANGELOG

@@ -1,5 +1,11 @@
 *Rails 3.0.0 [beta 3] (pending)*
 
+* Removed verify method in controllers. [JV]
+  It's now available as a plugin at http://github.com/rails/verification
+
+* Removed input, form, error_messages_for and error_message_on from views. [JV]
+  It's now available as a plugin at http://github.com/rails/dynamic_form
+
 * Routes can be scoped by controller module. [Jeremy Kemper]
 
     # /session => Auth::SessionsController

actionpack/lib/action_pack/version.rb

@@ -3,7 +3,7 @@ module ActionPack
     MAJOR = 3
     MINOR = 0
     TINY  = 0
-    BUILD = "beta2"
+    BUILD = "beta3"
 
     STRING = [MAJOR, MINOR, TINY, BUILD].join('.')
   end

activemodel/lib/active_model/version.rb

@@ -3,7 +3,7 @@ module ActiveModel
     MAJOR = 3
     MINOR = 0
     TINY  = 0
-    BUILD = "beta2"
+    BUILD = "beta3"
 
     STRING = [MAJOR, MINOR, TINY, BUILD].join('.')
   end

activerecord/lib/active_record/version.rb

@@ -3,7 +3,7 @@ module ActiveRecord
     MAJOR = 3
     MINOR = 0
     TINY  = 0
-    BUILD = "beta2"
+    BUILD = "beta3"
 
     STRING = [MAJOR, MINOR, TINY, BUILD].join('.')
   end

activeresource/lib/active_resource/version.rb

@@ -3,7 +3,7 @@ module ActiveResource
     MAJOR = 3
     MINOR = 0
     TINY  = 0
-    BUILD = "beta2"
+    BUILD = "beta3"
 
     STRING = [MAJOR, MINOR, TINY, BUILD].join('.')
   end

activesupport/lib/active_support/version.rb

@@ -3,7 +3,7 @@ module ActiveSupport
     MAJOR = 3
     MINOR = 0
     TINY  = 0
-    BUILD = "beta2"
+    BUILD = "beta3"
 
     STRING = [MAJOR, MINOR, TINY, BUILD].join('.')
   end

railties/lib/rails/version.rb

@@ -3,7 +3,7 @@ module Rails
     MAJOR = 3
     MINOR = 0
     TINY  = 0
-    BUILD = "beta2"
+    BUILD = "beta3"
 
     STRING = [MAJOR, MINOR, TINY, BUILD].join('.')
   end

version.rb

@@ -3,7 +3,7 @@ module Rails
     MAJOR = 3
     MINOR = 0
     TINY  = 0
-    BUILD = "beta2"
+    BUILD = "beta3"
 
     STRING = [MAJOR, MINOR, TINY, BUILD].join('.')
   end