As a result of a conversation elsewhere on Melbourne Film Blog, I went to Amazon to confirm the release date for Inland Empire. I found a nice video clip of David Lynch talking about the film specifically and also about film in general. It's eleven minutes long and apparently is only available on Amazon; I recommend it.
I know it's not on YouTube, because I searched unsuccessfully. But I did find there a trailer for Inland Empire and have embedded it below. I've previously posted information about the DVD, and the latest information about the film's theatrical release (updated as information comes to hand).
The 2nd Official US Trailer
The Official Italian Trailer