I suppose I am just a sucker for some of the new blog clients. The latest is Windows Live Writer, it is the one that Microsoft is promoting through their Windows Live line of services and products. It defaults to wanting to post to your Windows Live Spaces account. But it is pretty smart about connecting you to your own blog service/software or give you access through one of the blog APIs. The WYSIWYG seems pretty good has a kind of pared down version of Word feel to it. It is definitely a worthy competitor to the other clients (Performancing, Qumana, etc.).
(Update: I am finding it less than easy to add tags, and other things. There is a plugin for tags, flickr. If you want to add tags to two different services (say Technorati and del.icio.us) I am not even sure how you might do this.
With this list AIM Acronyms may be I can understand what everyone is saying