I am now typing this from [Textmate](http://macromates.com/), the Mac-only text-editing tool. I’m mighty pleased with Textmate, and now that [Tobias](http://blog.wrigstad.com/) pointed me to its Blogging bundle, more of my blogging will be done like this, from my favorite editor.
*Update:* Trouble hit me with the tagging part. Perhaps the Ultimate Tag Warrior plugin and the Bundle are as yet incompatible. Perhaps I bet on the wrong tagging library horse for WordPress? Perhaps I should contact the Blogging Bundle author, and ask for the feature?
I doubt TextMate can even become an Emacs replacement, but I must admit it comes closer than anything else I’ve tried so far. Emacs is a bitch to bend your way, but once you succeed, there is nothing like it. The text navigation facilities of Emacs are just unrivalled. I’m 1000% more productive in Emacs than in any other editor. I’ve ever remapped the keys so that the Swedish Mac keyboard sucks less when using LaTeX.
But TextMate is really good. I don’t regret paying for it for a second.