wordpress 2.2.1发布，它是2.2的臭虫修复和漏洞填补版。

重要臭虫修复：

* Atom feed validation fixes (#4274, #4307, #4381, #4382)
* XML-RPC fixes (#4314, #4329, #4315, #4469)
* Widget backward compatibility fixes (#4275)
* Widget layout fixes for IE7 (#4264, #4268)
* Page and Text Widget improvements (#4302, #4259)

漏洞填补：

* Remote shell injection in PHPMailer
* Remote SQL injection in XML-RPC Discovered by Alexander Concha.
* Unescaped attribute in default theme