I've had my blogs on TypePad for almost a year now, and I love them.
There are lots of ways to post, but I keep finding that the best way is to just go into the user interface and doing it.
Yes, I could and probably will install my own blogging software, but with this one, no nagging messages that I have to upgrade, and they do all the heaving lifting.
I've used Contribute to blog with Typepad — and it works well, but I haven't figured out a way to automatically post on Twitter. I could look it up, but why bother when the Typepad user interface works so well.
Plus I can post from the mobile phone, either using their software or through an email message. And I can put up stuff from Snagit — like this screen shot, in a very easy way.
Some other cool things: I can actually post from SnagIt. I am sure I can do the same with Screencast / Camtasia — something I need to play with.
Something else I really like is the Microblog — when I want to say something longer than 160 characters, I just post there, especially if it really doesn't fit the subject of my blogs.
But it's definately worth paying someone to do the maintanence and have a good platform to blog. If I just had the time — going to try to do better about carving out time.