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Here's a list of example uses from entity.test

 $wrapper->author = 0;
 $wrapper->url = 'dummy';
 $wrapper->author->mail = 'foo';
 $wrapper->author = NULL;
 $wrapper->author->set($GLOBALS['user']->uid);
 $wrapper->author->set($GLOBALS['user']);
 $wrapper->body->set(array('value' => "<b>The second body.</b>"));
 $wrapper->language('de');
 $wrapper->body->set(array('value' => "<b>Der zweite Text.</b>"));
 $wrapper->language(LANGUAGE_NONE);
 $wrapper->set($node);
 $wrapper->reference->name->set('foo');
 $wrapper->reference->set($wrapper);
 $wrapper->save();
 $wrapper->delete();
 $wrapper->type->set('article');
 $wrapper->author = $user->uid;
 $wrapper->{$property}[0] = '2009-10-05';
 $wrapper->field_image = array('fid' => $file->fid);
 $wrapper->$name->value();
 $wrapper->parent[] = $term_parent2;
 $wrapper->field_tags[1] = $term_parent;
 $wrapper->field_tags->set(array(2));
 $wrapper->field_tags = NULL;
 $wrapper->$field_name->set(NULL);
 $wrapper->field_text[0] = 'the text';
 $wrapper->field_text[0]->set(array('value' => "<b>The second body.</b>"));
 $wrapper->field_text2->summary = 'the summary';
 $wrapper->field_text2->value = 'the text';
 $wrapper->field_file[0] = array('fid' => $file->fid, 'display' => FALSE);
 $wrapper->field_file[0]->description = 'foo';
 $wrapper->field_file[0]->display = TRUE;
 $wrapper->field_file[1]->file = $file;
 $wrapper->field_file[] = array('description' => 'test');
 $wrapper->field_file = NULL;
 $wrapper->field_image = array('fid' => $file->fid);
 $wrapper->field_image->alt = 'foo';
 $wrapper->field_image->file = $file;
 $wrapper->field_image = array();


^^ Generated via:
# grep "^\W*\$wrapper->" entity/entity.test | tr -s " "






$node = entity_create('node', array ('type' => 'nodefile'));
$node->uid = 1;
$wrapper = entity_metadata_wrapper('node', $node);
$wrapper ->save();