O'Reilly Media book: Switching to the Mac: The Missing Manual, Mavericks Edition

Switching to the Mac: The Missing Manual, Mavericks Edition:
Ready to move to the Mac? This incomparable guide helps you make a smooth transition. New York Times columnist and Missing Manuals creator David Pogue gets you past four challenges: syncing with iOS, transferring your stuff, assembling Mac programs so you can do what you did with Windows, and learning your way around OS X Mavericks.

my VirtualBox on Mavericks crashed today, so I upgraded to 4.3.4

https://www.virtualbox.org/wiki/Downloads

Mavericks disorders the windows within my "desktops"

That's rather bad with my long running applications like the Chromium browser or my virtual machines running within VirtualBox. I have to stop the browser or even VirtualBox itself. And just a few minutes "ago", VirtualBox even aborted abruptly without saving the states of the virtual machines. I hate that.

Apple just suggested, that I should update X11 on Mavericks

http://xquartz.macosforge.org/downloads/SL/XQuartz-2.7.5.dmg

I would love to do it immediately, but I guess the DMG is big and I shouldn't do it through mobile phone Internet.