Apple has released iOS 4.3.1 for iPhone, iPad, and iPod touch and as expected, it's a bug fix release. So connect to iTunes, hit Check for Updates, and go get it!
Sorry, updating while in line for iPad 2! Yes, compatibility is the same adios 4.3 so no iPhone 3G, no Verizon iPhone. And if you're jailbroken and want to stay that way, hold off on updating until there's an iOS 4.3.1 jailbreak!
If you notice anything else, let us know!