After retrieving a feed, you can read the data from the feed or the entries contained in the feed using either the accessors defined in each of the data model classes or the magic accessors. Here's an example:
<?php
$client = Zend_Gdata_ClientLogin::getHttpClient($user, $pass, $service);
$gdata = new Zend_Gdata($client);
$query = new Zend_Gdata_Query(
'http://www.blogger.com/feeds/blogID/posts/default');
$query->setMaxResults(10);
$feed = $gdata->getFeed($query);
foreach ($feed as $entry) {
// using the magic accessor
echo 'Title: ' . $entry->title->text;
// using the defined accessors
echo 'Content: ' . $entry->getContent()->getText();
}