Of all of the places that I would never look for a blog software that can post to beta.blogger.com, I found myself on Microsoft's live site with Microsoft Live Write Beta...
Looks fairly cool so far- but I have to install dotnet 2.0 to be able to use the Flickr plugin- I will update after I install (and reboot?)
- edit -
Ok, VERY cool FREE software with plugins- and it works with Blogger Beta! One trick; I had to edit the registry at :
HKEY_CURRENT_USER\Software\Windows Live Writer\Weblogs\2e27accf-425c-4996-9c2d-a075aad9307a\
...and replace the 'www.blogger.com' references with 'beta.blogger.com' to make it work (info found here).