Paul Summerville took a shot at answering the question, in this speech that you can read at his site: "A 21st Century Liberal Budget." So if you're feeling a little put off or out of sorts today after yesterday's Flaherty budget, maybe the best remedy is to start thinking about and working on a future alternative economic plan. I recommend reading Paul's thoughts for that reason in particular.
It is meant, as he says, to provoke discussion, it is not a hard and fast plan. Some of it may be controversial. But it is a useful exercise to start moving the Conservative framed Overton window back toward a new Liberal way of thinking for the future.