[bedoig]

The HTC website says this:

"Built-in Wi-Fi and TV-out functionality* mean you can hook up to the local wireless hot spot to surf, then deliver the perfect PowerPoint® presentation without a laptop in sight."

To me that implies some kind of digital output (dvi/vga). I suppose most projectors have analog inputs as well though, so who knows. Unfortunately, composite seems like the most likely choice by far.