Each time I make a post with WLW, it creates a recent file shortcut for the post and for a draft. So when you look at the WLW jumplist (taskbar or start menu) there are 2 entries for every post.
Unless I explicitly saved a draft (very rare), the draft shortcuts point to a 0-byte file, and clicking on it produces a "Not Found" error message.
This issue doesn't seem to be getting any traction via the W7 beta reporting process.