<input type="checkbox" name="lala" value="1" checked="checked" />
<input type="checkbox" name="blah" value="2" />
<button onclick="getData();">Получить</button>
<script src="http://code.jquery.com/jquery.min.js" type="text/javascript"></script>
<script>
function getData() {
var arr = jQuery('input[type="checkbox"]:checked').serializeArray();
var out = {};
for( var i = 0; i < arr.length; i++ ) {
out[ arr[ i ].name ] = arr[ i ].value;
}
alert( JSON.stringify( out ) );
}
</script>