Okay, BlogApp is the first I've used so far... It's VERY fast. Accessed my account in under a second, posted and published in a little under 3 seconds. (And I'm on a 56k.) Every post, though, it comes up with a nag screen (which isn't too bad.) I'll be back later with more
I tried using Dan Schimpf's MacJournal. It's free, designed for OS X, and is a lovely piece of work. I didn't end up using it b/c my site software (b2evolution) has a web interface, but check out M.J. It can post to most blog services.
Edit: Actually, if any mac user has successfully posted to a website using MacJournal, I can't seem to get my password to work correctly. I think it's just me, but any tips would be appreciated.
Yep, MacJournal is one nice piece of software. I use it all the time and can really recommend it. A lot of features, good support AND it's free.
It's so good that I actually contributed.