Here's the longer-form demo video from the T-Mobile G1 Launch Event, with a quick focus on how easy the Amazon MP3 store is to use on the G1. The long-press as "right click" or "context click" also get some attention as well.

Update: Full video now posted, to the dulcet sounds of silence (Hey, T-Mobile has rocking music on their just-posted site, we figured you cubicle-types could use a break!)