Apple released a bunch of software updates today to bring all of its services and devices in parity with each other, and that includes iBooks Author. iBooks Author is the free software that allows you to create rich eBooks for the iPad. WIth the new Retina display iPad being launched today at the iPad event, it's only natural that iBooks Author would see Retina display support. You can grab the update from the Mac App Store.
Continuing the plethora of Apple updates today, iPhoto has been updated to version 9.2.2. the big change here is that now you can delete pictures from your iCloud Photo Stream, a feature that was also released in iOS 5.1 today as well. You can get the download through Software Update, or through the Mac App Store.
If you're an iLife '11 user, you'll wanna fire up Software Update (or launch the Mac App Store, depending on which version you own) to grab today's updates that Apple has released for iPhoto, GarageBand, and iMovie. iPhoto and GarageBand pick up a bunch of bug fixes and stability improvements, while iMovie gets the ability to import and edit projects that were created in the iOS version of the program.