Keyboard shortcut to close all tabs but current one in Visual Studio?

Quick answer: ALT+-+A

Tested on Visual Studio 2013. On the window that you want to keep open press ALT+-, this will open the window top left menu, then press A to close all windows but the current one.

By default, the command File.CloseAllButThis does not have a keyboard binding. You can set one up yourself though, as shown here:

In this example, I'm going to map CTRL + SHIFT + ALT + W to File.CloseAllButThis in global scope. You may like to set the scope to only the text editor.

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I close all documents using ALT + W + L.

This is available in Visual Studio without any special plugins or configuration. It just uses the tool bar mnemonics. The corresponding command is Window.CloseAllDocuments in case you wish to bind it to something else.

I don't think there is one by default, but you can go to Tools>Options>Environment>Keyboard and bind a key to File.CloseAllButThis.

I use ctrl+alt+w