Yesterday, I finally updated my iPad to the iOS4.2 version. It seemed like it would be cooler. Among the more relevant (to me) changes offered are: (as advertised on the Apple website):
Game Center: Be more social with your gaming. Find friends or use auto-match to play multiplayer games against new opponents. Track achievements and compare high scores.5
iTunes TV show rentals: Rent TV shows commercial free in HD for just 99¢ an episode and start watching them in minutes.
Even better Mail: See messages from all your accounts in a unified inbox, organize messages by threads, and open attachments in third-party apps.
Notes with fonts: Customize your notes using different fonts — Marker Felt, Helvetica, and Chalkboard.
Keyboard and dictionary enhancements: iOS 4.2 includes support for over 50 languages and dialects, with more than 30 new international keyboards and dictionaries for iPad.
Plus, they added a multi-tasking feature, the ability to wirelessly print (if I had such a printer) and the even cooler ability to stream digital media from my iPad to an Apple TV (if I had such a TV). I mean, overall, it seems cool.
Off I went to bed, excited to explore all the newbies on my iPad. I click on the upper right hand corner button to lock my screen so I can keep everything on Portrait even while lying in bed. Funny…but it kept showing me the Mute icon instead. I click on it again…and it brings the sound back.
I literally flipped my damned iPad around and around searching for any other kind of button that would somehow lock my screen.
No success.
Really? Who ever thought that having a mute button (as well as a volume button you only have to press a few times to get to mute) was way more important than keeping what I’m reading/watching/playing still in case I actually lean over too much in one direction???
Stupid update.
And on another note, the battery life is half what it used to be. I still haven’t figured out why yet. I’m assuming it’s because of the “multi-tasking” capabilities. Although, I don’t know what my iPad is multitasking when all I’m doing is reading my Bar outlines on iBook…
All I want to know now is how to “downgrade” back to the previous version. This new one and I are not getting along.
Stop and Stare 
Double click the home button. When the multitask bar shows up, swipe to the right, and you’ll see the screen orientation lock icon on the left side.
aHHH!!! You are awesome! Thanks!