Ever heard of it? It's an event for people who spend their days develping programming languages, kinda like PDC of DevDays, or MIX, or TechEd. The main difference is that it's dedicated to a small community of people focused on programming languages. It was held in Microsoft Corporate Redmond in 14 to 16th April and you can get all the talks here:

 

http://www.langnetsymposium.com/2009/talks.aspx

 

This post is kinda late but nevertheless, here are some bits to spice up a bit: IronPython, CLR, F#, JVM, CCI, PowerShell, Irony, Eagle, Pex...

 

Enjoy :)