It seems that the "Insert Tags..." thing in Windows Live Writer is customizable enough that it is possible to add support for blogger labels by doing the following:
- Insert tags ... -> Choose (Customize Providers...) in dropdown list
- Add...
- Set provider name appropriately so that you know it e.g. blogger
- Set template to:
<a href="http://obviously-your-blog-name.blogspot.com/search/label/{tag-encoded}"
rel="tag">{tag}</a>
- Set tag separator to ", " (without the quotes)
- Set htm caption to "<span class="post-labels">Labels: {tag-group}</span>" (without the quotes)
If you do that, and add tags using that provider, the tags should work exactly as when blogging via web-ui.
EDIT: it seems that the labels do not show up on the edit posts page in the web ui. I wonder if that matters?
EDIT2: it looks correct but does not work... (