I'm currently trying out Microsoft's Beta Windows Live Writer. I have to admit that I mostly like it...
It has comfortable look and feel of a Windows application - since it is essentially some kind of Frontpage/Word hybrid, that's what you would expect. And for that reason I could seriously see enterprise users adopting it very easily.
But there is always a "but" - can I find a simple plugin that will let me insert tags AND that will actually install? I don't know why, but this stuff is just so much easier in Mozilla Firefox and Thunderbird! Any ideas anyone?
UPDATE: Charles Teague from the Live Writer team pointed me in the right direction... I'm now up and running with the latest version and that has solved my tagging needs!