I'm cross-referencing this blog post titled APPHACK @ AU in case you haven't seen this yet...
Here’s a chance to win US$5000 (and a lot of publicity) for your next great idea for an AutoCAD app.
APPHACK @ AU is a virtual code-fest to produce apps/plugins for AutoCAD using the ObjectARX and/or .NET APIs, and it's open to any ADN member who can produce a working app/plugin for AutoCAD. The event culminates in a live demo at Autodesk University in Las Vegas on November 26, 2012. Simply submit your app and a demo video and you're in the running for some nice prizes. But hurry - the deadline for submissions is 11:59pm Pacific on Wednesday, 14 November, 2012.