There’s only one thing I’ve left behind in my move from PC to Mac. Windows Live Writer is widely accepted as the single best blogging app - and I’d tend to agree I really love using WLW on Windows.
I’ve started using Scribefire now - as an extension to Google Chrome on the Mac which seems pretty decent too. It’s platform agnostic being a Chrome extension so check it out regardless of which platform you’re on. http://www.scribefire.com/