In her post, When the straw man misses the reality bus, media girl discusses many things, one of which is the difference between liberals and progressives.
Here’s an excerpt:
The first — and main — mistake here is equating “progressive” with “liberal.” Now I’m one of the first to admit that there’s a lot of overlap. But I feel, at least from my perspective, that there are some important distinctions between the two: progressive means having a dynamic, proactive government that actively participates in the economy and the fabric of our culture, while liberal comes with assumptions about the kinds of programs the government provides. In some ways, liberalism goes beyond progressivism in the manner and approach of such programs, while progressivism goes beyond liberalism in the scope and goals of what a proactive government can achieve. At least that’s how I see it. (For the record, I consider myself a progressive who is sympathetic to the liberal cause.)
I also consider myself a progressive, not a liberal. I would actually go further than media girl did and say that liberals are often conflated with Democrats, although the two aren’t technically synonomous.
Anyway, it’s a great read that I’m too lazy to go through in detail, so if you want to know more you’ll have to go read it for yourself. I promise you won’t regret it if you do.