According to patch of blogapi.module, the second problem is to save category properly. Since the taxonomy.module now support load operation in nodeapi hook, $node->taxonomy is not just a plain array of string anymore. Instead it is a standard class so taxonomy.module must handle the object correct.

--- taxonomy.module.orig  2006-01-26 15:33:20.000000000 +0700
+++ taxonomy.module        2006-01-27 20:55:11.000000000 +0700
@@ -644,6 +644,9 @@
           }
         }
       }
+      else if (is_object($term)) {
+        db_query("INSERT INTO {term_node} (nid, tid) VALUES (%d, %d)", $nid, $term->tid);
+      }
       else if ($term) {
         db_query("INSERT INTO {term_node} (nid, tid) VALUES (%d, %d)", $nid, $term);
       }

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