Sorry this is short notice, but there's an MSDN webcast *today* covering dynamic 
languages and the DLR, and I thought those on this list might be interested.

I doubt there will be any discussion about PHP on the DLR, but I think you can 
submit questions ahead of time from the link below.

For details and webcast registration:
<http://msevents.microsoft.com/CUI/WebCastEventDetails.aspx?EventID=1032387088&EventCategory=4&culture=en-US&CountryCode=US>

Brief overview from the page above:
"In this geekSpeak, Mike Vincent explains how dynamic languages like Iron Python 
and Iron Ruby running on the Dynamic Language Runtime (DLR) give you new options 
when choosing the best tool for the job. Mike addresses the advantages you can 
gain from using dynamic languages, when and where you should consider dynamic 
languages, and what is important from the architect's view, the developer's 
view, and the business case view."

-- 
Ben Ramsey
http://benramsey.com/