Mavericks now considers each monitor a "Space". As a result, apps launch and have their menu bar in whichever monitor they were launched from. However, it's easy to assign apps to each monitor. Here's how:
First, you need to create an additional space in Mission Control. You can add it to either monitor.
Having done that, then when you right-click on an app in the Dock, you will see the option to assign the app to All Desktops, Desktop on Display 1, Desktop on Display 2.
If you are a heavy user of Spaces with multiple displays, then you have likely found that the new "full screen improvements" in Mavericks are a giant leap backwards. To get the old behavior back, just go to Mission Control in the System Preferences and uncheck the box labeled "Displays have separate Spaces."
Looks like Mavericks 10.9 has changed the behavior for adding application/document shortcuts to the Finder toolbar.
Where before you could simply drag any icon up to the Finder toolbar and hold it there for a second to add it, you now need to first hold down Option+Command and then start dragging the desired icon to the toolbar.
You can still remove the icons the same way as before: holding down Command, dragging the icon away from the toolbar and then releasing.
Finally after updating to Mavericks I thought I'd have another crack at changing the resolution of my headless Mac mini without using the VGA adapter hack. It is now much easier, as long as you know the trick to it.
First off you need an app to change the screen resolution (scrutil no longer worked for me so I downloaded Display Menu (free) from the Mac App Store).
After changing the display resolution my VNC/Screen Sharing sessions kept blacking out and I couldn't see anything so I fired up SSH and killed the screen sharing agent (killall ScreensharingAgent) and bam finally my remote screen lit up at my specified resolution (2560x1440). However my Dock was still in the middle of the screen (and killing the Dock seems to reset the resolution), so just right clicking the dock and changing its location made it fix itself up :)
Starting with OS X 10.8 Mountain Lion, your Mac could take dictation. But, just as with the dictation feature on iOS, the OS X incarnation required an Internet connection, couldn't show its progress while you spoke, and could only listen for about 30 seconds at a time.
That all changes with a single checkbox in Mavericks (OS X 10.9). Fire up System Preferences and click on the Dictation & Speech pane. There, you'll find a checkbox for Use Enhanced Dictation. The first time you check it, you'll need to wait out a hefty download (between 700 and 800 megabytes), but once you're done, you can dictate a lot more freely.
Now, transcription happens on your Mac, not Apple's servers. And you can see the transcription appear as you speak, in real-time. In fact, the cursor remains active too; if you see a mistake, you can click around (without speaking) to make your edits, put the cursor back where it needs to be, and start talking again. Unfortunately, however, Mavericks doesn't offer any ability to use speech-based editing tricks: If you say "delete that," Mavericks types "delete that."
New in Mavericks, Notification Center banners for reminders include a Snooze button. But that button, which removes the reminder and brings it up again ten minutes later, offers more customization than is immediately apparently.
Click and hold on the Snooze button to bring up a drop down menu with snooze times ranging from minutes to hours to days to weeks.