Don't update to iOS 4.3! It's made my 1st gen iPad sluggish, unresponsive at touch sometimes, only good thing about it was getting the orientation lock switch back, but I wanted to go back to 4.2.1 but I keep getting an error in iTunes. This was probably Apple's way of making 1st gen iPad owners have to buy iPad 2.
Side note: all the new iPad 2 only apps in the appstore are laughing at my 1st gen iPad. /bitter
Can't afford to keep up with the hardware every year, I'm sure others won't be either come iPad 3, 4, 5, 6, 7, etc...