fast switching of mailboxes, sending large attachments without attaching - Mail Drop
send big (up to 5GB) attachments via iCloud - integrated on the Mac, other clients get a URL to download it
Markup on email, PDFs draw via trackpad to scribble notes
Safari - single bar of UI: smart search bar gets Spotlight search suggestions
Safari sharing with recent contacts
first browser to introduce private browsing, now better with a private window of tabs
WebGL, SPDY, IndexedDB, 2 hours longer battery life playing video.
boasting DOM performance, complex web app Java App 4 tier compiler speed
Brian showing a demo of Safari
simpler, more powerful design, sidebar of bookmarks, shared links
search field pops up all your favorite sites
spotlight search offers "regular" google search, but also adds new previews for common search subjects
new Tab View of all your open tabs, like expose
share pages with recent recipients
Markup in Mail, annotate image with an enlargement loupe, drawing controls for scribbling an arrow that converts it into a nice looking line. draw a cartoon bubble and markup makes it look nice with text
Use the right device for the moment, use AirDrop between iOS and Mac