So I've been using Windows Live Writer for about a week now and I ran into a glaring bug when using Live Writer on multiple computers to post to a central blog.  A collegue of mine told me about a typo I had on my last post and so I fired up Live Writer and wanted to download the previous posts from my blog.  You do this you go to File..Open Post.. and you'll see the following selection on the left pane of the window:

So I select my blog which results in downloading the various post from your blog using the webservices api provided by your blogging software.  So I open what I thought was the post that I wanted to edit and a totally different post popped up instead.  What!?  So I figured out that locally Live Writer is caching the posts and somehow the unique blog post identifier got out of sync (since I was attemping to edit the post from a different computer than the one I original used for posting the entry).  So I had to go back to my laptop to actually make the edit happen which took roughly threee minutes.  Ugh.

Another collegue of mine has posted his feedback on Windows Live Writer here.  While its a great beta tool it still has a ways to go.  Keep it up Microsoft.