Index: test/types_test.rb
===================================================================
--- test/types_test.rb	(revision 312)
+++ test/types_test.rb	(working copy)
@@ -8,7 +8,6 @@
     :symbol  => "'--- :symbol\n'",
     1        => '1',
     1.2      => '1.2',
-    nil      => 'NULL',
     true     => '1',
     false    => '0',
     Time.now     => "'#{Time.now.to_s(:db)}'",
@@ -27,17 +26,17 @@
     sql = User.select { |m| m.name == 1.2 }.to_sql
     sql.should == "SELECT * FROM users WHERE users.`name` = 1.2"
   end
-
+  
   specify "integer" do
     sql = User.select { |m| m.name == 1 }.to_sql
     sql.should == "SELECT * FROM users WHERE users.`name` = 1"
   end
-
+  
   specify "true" do
     sql = User.select { |m| m.name == true }.to_sql
     sql.should == "SELECT * FROM users WHERE users.`name` = 1"
   end
-
+  
   specify "false" do
     sql = User.select { |m| m.name == false }.to_sql
     sql.should == "SELECT * FROM users WHERE users.`name` = 0"
@@ -45,7 +44,7 @@
 
   specify "nil" do
     sql = User.select { |m| m.name == nil }.to_sql
-    sql.should == "SELECT * FROM users WHERE users.`name` = NULL"
+    sql.should == "SELECT * FROM users WHERE users.`name` is NULL"
   end
 
   xspecify "Time" do
Index: lib/ambition/where.rb
===================================================================
--- lib/ambition/where.rb	(revision 312)
+++ lib/ambition/where.rb	(working copy)
@@ -121,11 +121,16 @@
         raise "Not implemented: #{method}"
       end
     end
-
+    
     def translation(receiver, method, other)
       case method.to_s
       when '=='
-        "#{process(receiver)} = #{process(other)}"
+        case other_value = process(other)
+        when "NULL"
+          "#{process(receiver)} is #{other_value}"
+        else
+          "#{process(receiver)} = #{other_value}"
+        end
       when '<>', '>', '<'
         "#{process(receiver)} #{method} #{process(other)}"
       when 'include?'