Specifically, there's five questions he's wondering about:

• Do you know about portal/portlet technology?
• Do you like it?
• Is it a cool idea to create a PHP analog of javax.portlet?
• Do you want to participate in such project?
• Will you use it in your projects?

There's been a good comments on the post already from Bill Karwin (of the Zend Framework project) mentioning some of his experience on the matter and on how portlets usually work.