Chronic Dev Team has released Corona v1.0-7 to fix some iBooks issues, and just after its release v1.0-8 is rolled out which address iBooks image loading bugs for iPhone 4S.
It is recommended for iPhone 4S and iPad 2 jailbroken iDevices to install Corona 1.0-8 which you can grab through Cydia.
Apple released iOS 5.0.1 update with bug fixes, improvements and security fixes to its developers which could be downloaded through iOS Dev Center with Apple account via link below.
iOS 5.0.1 Updates:
Fixes bugs affecting battery life
Adds Multitasking Gestures for original iPad
Resolves bugs with Documents in the Cloud
Improves voice recognition for Australian users using dictation
Contains security improvements iOS 5.0.1 beta introduces a new way for developers to specify files that should remain on device, even in low storage situations
The iOS 5.0.1 works with iPhone 4S, 4, 3GS, iPod Touch [...]
Apple has released iOS 4.3.1 update with bug fixes and battery improvements for iPhone 4 (GSM), 3GS, iPod Touch 4G, 3G, and iPad 2,1.
iOS 4.3.1 Features
Fixes an occasional graphics glitch on the 4th generation iPod touch
Resolves bugs relating to activating and connecting to some cellular networks
Fixes image flicker when using Apple Digital AV Adapter with some TVs
Resolves an issue authenticating with some enterprise web service
You can download iOS 4.3.1 according to your iDevice requirement via following direct download links.
Download iOS 4.3.1
iPhone 4 GSM
iPod Touch 3G
Folks at iH8sn0w has released jailbreak tool Sn0wbreeze 2.3b2 for iOS 4.3 that is updated to fix some issues which were observed by users in Sn0wbreeze 2.3b1 for iOS 4.3.
How to Jailbreak iPhone 4, 3GS, iPod Touch 4G, 3G, iPad 1 on iOS 4.3 with Sn0wBreeze
What’s New in Sn0wbreeze 2.3b2:
Added iREB to top bar for future re-runs within sn0wbreeze
Adds Multitasking Gestures option in Settings App
Rare iPad 1G issues resolved
iBooty bug fixes (Includes iBSS issues)
Sleep bug in iPod Touches is fixed
MobileSubstrate is now working
iBooty is EVEN faster
Sn0wbreeze 2.3b2 is a tethered [...]
Dev-Team has updated PwnageTool to version 4.01 to jailbreak iOS 4 on iPhone 3GS (OLD BootROM), 3G and iPod Touch 2G (Non-MC). PwnageTool 4.01 fixes the iBooks issue in jailbroken iDevices that came with PwnageTool 4.0.
PwnageTool was released yesterday to jailbreak iOS 4.0 for iPhone 3GS, 3G and iPod Touch 2G. download links are updated in earlier post here. Below are the jailbreak iOS 4 guides using PwnageTool: