Why does the CheckBoxFor render an additional input tag, and how can I get the value using the FormCollection?

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Have a look here:

http://forums.asp.net/t/1314753.aspx

This isn’t a bug, and is in fact the same approach that both Ruby on
Rails and MonoRail use.

When you submit a form with a checkbox, the value is only posted if
the checkbox is checked. So, if you leave the checkbox unchecked then
nothing will be sent to the server when in many situations you would
want false to be sent instead. As the hidden input has the same name
as the checkbox, then if the checkbox is unchecked you’ll still get a
‘false’ sent to the server.

When the checkbox is checked, the ModelBinder will automatically take
care of extracting the ‘true’ from the ‘true,false’

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