Leftwing vs Rightwing vs liberal vs conservative vs moderate vs progressive...

I was reading this article on Progressive Republican about the terms that get thrown around. I liked it a lot, so I'm going to paste much of it here. Basically, the author, William Golden, is tired of labels being thrown at the other side and back as insults. Especially when "liberals" or "progressives" are labelled as "left-wing" and "conservatives" are called "right-wing"...

Here are his definitions. I think I agree with them:
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Left-wing and Right-wingers often sound like liberals and conservatives but are not afraid to trample truth in order to achieve their political goals. “Propaganda” is often too strong a term to even begin to describe the logic and the veracity of what passes as political discussion from both ends of the spectrum.

Liberals and Conservatives both have principles and represent what is best in America. They just disagree. They may even see truth differently but they both try to put America first. America is not a victim when these two meet — preferably over a beer or some other wholesome American pasttime. America is blessed because at the end of the day we all, liberal and conservative alike, are challenged in our views and there wisdom and answers from both.

A Moderate is absolutely the finest blending of red, white and blue. Moderates are perhaps the most practical of all Americans — their focus is on consideration of the facts and selecting the best solutions. Unlike liberals and conservatives they seldom have the hurdle of having to get past their pride to get on with getting on to finding an answer. Unfortunately perhaps, being a political moderate does not work everywhere in the USA and the result is that moderate politicians are often caught crossing the street when the light turns against them. God bless them.

Progressives are made up of liberals, moderates and conservatives. A progressive will normally claim fondness for one of the aforementioned political outlooks. The two greatest differences between progressives and their other American kinfolk is that they are proactive, rather than reactive; and they live in the land of ‘why not?!’ Progressives sometimes share the same challenges that moderates do, except they’ve figured out how to run like hell across the street when they see the lights change.
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I like these definitions. Anyone want to add to them?