Howard Ship is the guy behind Tapestry which is one of the better component frameworks out there. In a post today he is drawing attention to PRADO which is a PHP component framework that is based on the ideas in Tapestry. I haven't checked out PRADO in a long time but it looks like they are still moving forward and making good progress.

Jackson also mentions the one thing that he really took from Howard's post, that he's "raising the bar" with a challenge that Tapestry will always be the leader in this realm, though.