I'm not planning on making a habit of this, but having spent the time putting together the Monospace conference app and seeing tweets from various Mono people that they were heading to PDC09, I figured it wouldn't take too long to copy some PDC data into the existing MonoTouch C# app 'framework'.
A new view (Sessions), a new icon (Speakers) and a new location (Underground) are the main changes - the rest is just SQLite and graphic tweaks. The source is available for download - PDC09_01.zip (124Kb).
NOTE: This is for demonstration purposes only - the Speakers data is incomplete and the Schedule & Sessions are subject to change! Use at your own risk :)
UPDATE: to be clear, this app is not available on the AppStore -- it is just an example of the kind of thing you can write in C# for the iPhone using MonoTouch from Novell. If you have a MonoTouch licence then you can download the source (124Kb) and install it on your phone.