I seem to have two speeds when it comes to posting: the quick hit-and-run post with a link to something interesting, or a more in-depth musing that benefits from my walking around it every couple of days and judging how it looks from all angles.
What is also happening is that I find myself thinking about writing posts all the time. When something crosses my path, I wonder if it will make good blog fodder (blodder?). Newspaper columnists face the same situation; the column becomes a hungry beast that demands incessant feeding and attention.
My tools adapt themselves to the kind of writing I'm doing that day or week. I discovered I'm fine composing my quicker posts with the WordPress editor. Longer posts tend to start out in nvALT and may move to Microsoft Word, if I want to use the tools there. (I also keep a long list of ideas in nvALT and add to it all the time.)
I thought at one time I'd buy MarsEdit or some other desktop app to write my posts off-line, but I find that it's not really necessary. I build my posts up in layers, so the tool I use is independent of the writing/gestation process. I work on the words in several passes, move the text to WordPress, layer in the links in another, and then use the Zemanta plugin to suggest images or to spur my quest to find better ones. I don't always use the same tool for the initial drafts.
Before I publish, I preview the post and read it again in the browser; I regularly find formatting, typo, and phrasing problems that way.
This process is not bulletproof, of course. I would like a more scheduled, routine time to write and edit my posts, rather than the pockets of time I spend on it throughout the week. My drafting process feels too haphazard and too subject to disruption.
I'm at that point on the mastery curve where I've plateaued. The big a-HA! discoveries of technique and content came in the first 2 or 3 weeks, and I'm now trying to establish a regular writing routine, an assembly line that can crank out widgets in the shape of blog posts. The a-has are rather slower in coming and I need to be content waiting for the idea or insight that kicks me up to the next level.
Until then: make lots of pots.