* Win+L equivalent : Ctrl+shift+power (actually puts to sleep, but also achieves locking). I usually assign the hot corner for sleep/lock, often faster than keyboard. You can also remap keyboard to Ctrl-L (or whatever) for sleep/lock, using free OSS Karabiner.
* Win+arrow equivalent: NONE - but there's free OSS alternatives, such as Spectacle.
* Alt-Tab: Actually I like Mac's version than Windows. Also Mac has Cmd-backtick, which doesn't exist on Windows. What bugs me about Windows' Alt-Tab is that it cycles through minimized windows, which I want to ignore.
Does not work if you do not have password on screensaver enabled like I do. Windows+L is always locking.
> What bugs me about Windows' Alt-Tab is that it cycles through minimized windows, which I want to ignore.
... which makes a mouse neccessary to "revive" minimized windows. Thanks but no thanks... people always wonder why I'm so speedy using a computer, it is because I do most things using a keyboard and accomplishing more tasks than they do simply by avoiding aiming with a mouse cursor.
Or by installing Hyperswitch, so you can switch between multiple open windows of the same app. Built-in alt-tab of OS X deserves to rot in a hellfire, same for the "multiple virtual desktops" crap which I have not found a way to completely disable in over two years.
And for getting multiple apps (e.g. iTerm with an editor) and a browser side by side on the same monitor, install SizeUp and split, rearrange and shift windows with a breeze.
That OS X does not come along with anything that resembles Alt-Tab, Windows+(arrow key) for window shifting or even fucking Windows+L for screen lock is... unbelievable.