1. The main reason I went back. I use that button every time I need to look at a pdf. I leave the iPad in landscape most of the time but when I need to see something in portrait I can't have the damned thing spinning around whenever I put it down. The software switch doesn't cut it.
2. Reminds me of WinCE. Very few times have I needed anything more than what was in 3.2
3. Yep. I'd like better access to what I have already. Being able to stream from a limited capacity device to an HDMI only zero capacity device is pointless. I have years worth of tv shows and movies already stored on my old Apple TV. What does running down the battery of my iPad serve. I might as well use a cable, then I wouldn't be limited to HDMI.
4. It will be a cold day in hell before I buy any HP product. Even though I print quite a bit, I'm not going to buy a new printer either.
On the plus side, unified mailbox and folders. Whoopie. Downside, the iWork updates won't install on 3.2.
At least it wasn't as bad as the iPhone 3G update. No new features, not even find in safari. Either the same or slower than 4.1. It broke the sorting of tv shows in the iPod app. All shows now get grouped under 'unknown'.