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? sites/default/settings.php
Index: includes/database/mysql/schema.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/database/mysql/schema.inc,v
retrieving revision 1.1
diff -u -p -r1.1 schema.inc
--- includes/database/mysql/schema.inc	21 Aug 2008 19:36:36 -0000	1.1
+++ includes/database/mysql/schema.inc	26 Aug 2008 17:16:41 -0000
@@ -73,6 +73,12 @@ class DatabaseSchema_mysql extends Datab
   protected function createFieldSql($name, $spec) {
     $sql = "`" . $name . "` " . $spec['mysql_type'];
   
+    // BLOB and TEXT columns cannot have DEFAULT values.
+    // Refer to http://dev.mysql.com/doc/refman/5.1/en/blob.html
+    if (($spec['type'] == 'text') || ($spec['type'] == 'blob')) {
+      unset($spec['default']);
+    }
+    
     if (isset($spec['length'])) {
       $sql .= '(' . $spec['length'] . ')';
     }