Mac Mail is also getting an overhaul, with improved search, a two- or three-column interface, and a Gmail-like conversation view.
Other new features: A Windows migration tool and FaceTime.
While you can still install software onto Macs from a variety of sources, just like you can with Windows, Apple is pushing the Mac App Store as the new hub for software downloads. Updates will be easier, because you'll only have to download the additional code rather than the whole application, and a sandboxing feature will supposedly keep apps safe. While live-blogging the WWDC keynote, Macworld editor Jason Snell said it "will be interesting to see how secure it is and if it becomes a meme that App Store apps are safer than non-App Store apps."
Apps downloaded form the App Store will appear on your Launchpad, an iPhone-like interface which displays your apps in rows and columns on your desktop. Apps will also remember your most recent state, so when you launch an app you'll go back to where you were when you quit, Macworld reports. That's similar to how things work with the iPhone and iPad.
Read more about software in Network World's Software section.