Who's your favorite WP hosting provider (and why)?

Here’s an open-ended question if there ever was one. I’m on a dedicated box, but it has some issues. I’m thinking of moving to another provider.

Who do you use? What configuration do you have for what kind of traffic? What works for you and what doesn’t? Is it shared, virtual private, etc? How well is it working? How responsive is your vendor? Any nasty surprises?

So, you know, simple question. Have at it.