well, one reason i haven't updated tag4writer (which i now consider to be an archived project -- at least i won't be touching it) is that tagging support is now added into the latest refresh of windows live writer:

the tagging support now included was exactly the direction tag4writer was heading with exposing the templates for configuration, etc. you'll notice the tagging support in writer has some cool memory-sense (intellisense-ish).
along with tagging support, here are some other updates:
- blogger beta
- categories changes
- improved startup
- improved style detection
- and some others...
learn about all the updates and get the refresh from the windows live writer site. install it, then make sure you install flickr4writer :-).