Ricky Bloomfield has released a major update to G-Whizz, his integrated Google Mobile App browser for iOS devices. G-Whizz 1.3 introduces support for Fast App Switching on multitasking-capable iOS 4 devices and full Retina Display support for the iPhone 4. Tabs for Facebook and Twitter mobile apps are now also provided along with support for Read It Later and Tweet This browser actions in addition to existing Instapaper integration. Unread notification counts are now provided for Google Voice, Google Talk Facebook, Twitter and MySpace as well as audio and vibration alerts. Other improvements include an in-app settings tab, automatic loading of all tabs on startup for quicker browsing, and integration with Prowl for Push Notification support. G-Whizz Pro is available from the App Store for $5.